Ultimate Guide to Priming Miniatures 🎨 (Spray, Airbrush, and Brush-On)

Hey there, maker! I'm Mr. Resin, and before you dive straight into painting that freshly printed miniature, hold up for a second. We need to talk about that one step most people skip — and trust me, from experience, it changes EVERYTHING: priming miniatures. I know, I know... the urge to just start painting can be almost impossible to resist, but going in without primer is a first-class ticket to frustration.

Why Priming Is the Step That Makes or Breaks Your Miniatures

Don't worry, I've got you covered! You're probably thinking: "Is it really that big a deal? I just want to paint!" I've been there — I get it completely. But after years of experience and more than a few ruined minis, I've learned my lesson: a good primer coat is what separates a professional finish that survives gaming sessions and house moves from paint that chips at the slightest touch. It's an essential step, whether you're working with the best photopolymer resins or you're more of an FDM filament person.

The Bridge Between Your Print and Your Paint

Think of primer as the invisible glue between your miniature and the paint. In my experience, the surfaces of printed parts — whether resin or plastics like PLA — are incredibly smooth and non-porous. Acrylic paint on its own just slides right off because there's nothing to grip onto.

Primer creates a base coat with an ultra-fine microtexture, giving the paint that "tooth" it needs to bond with incredible strength. It's like trying to write with a pen on glass versus writing on paper. You need that slight roughness to make everything work.

From experience, primed minis not only hold up far better to the handling that comes with tabletop gaming, they also resist changes in temperature and humidity without the paint cracking or peeling. It's the best insurance policy you can buy for all those hours of work!

A Unified Canvas for Vibrant Colours

Another superpower of miniature primer is that it unifies the colour across the entire piece. Imagine you've printed a figure in dark grey resin. If you try to paint yellow straight over it, you'll need a ridiculous number of coats just to stop the base colour from killing the vibrancy and leaving you with a dull, washed-out result.

A coat of primer gives you a neutral, uniform canvas to work from. The advantages are huge:

• Colours that pop: A white or light grey base will make your colours sing, especially warm tones like yellows, reds, and oranges.
• Save paint (and time): You won't need to layer coat after coat to get solid coverage. Fewer passes, fewer pots of paint used up.
• Army-wide consistency: If you're painting a whole batch of figures, you guarantee they all start from the same baseline. The finished result will look far more cohesive.

The Defect Revealer That Saves You from Disaster

Here's a trick I've come to truly appreciate over time: primer is an incredible defect revealer. It's the best quality control tool you'll have before you ever pick up a brush.

That thin, matte layer brings every little imperfection out into the open — things you'd never spot with the naked eye. Suddenly, those stubborn layer lines, support marks you were sure you'd sanded away, or a tiny gap will show up with startling clarity. It gives you one last golden opportunity to reach for the putty or give it another pass with the sandpaper before it's too late.

Trust me, it's infinitely easier to fix things at this stage than when you're already three layers of paint deep. Taking a little time upfront is the secret to making all your hard work shine the way it deserves. Let's get into it! 😉

How to Prepare Your Miniature Before Priming

So, we've established that miniature priming is a sacred step. Now it's time to roll up your sleeves and get your piece properly prepped, because even the best primer in the world won't work miracles on a rough surface. Trust me, good preparation is 50% of the battle.

Let me walk you through my routine — the one I follow religiously before a single drop of primer gets anywhere near my figures. Follow this, and you'll have a perfect canvas to work with.

Remove Supports Without Leaving a Mark

The first enemy to tackle is your supports. Whether you're working with resin or FDM, removing them cleanly is an art that takes patience. Don't just yank them off!

• For resin: My go-to trick is submerging the freshly printed piece (before final curing) in warm water for about 30–60 seconds. This softens the supports beautifully. Then, with a pair of flush cutters, they come away almost on their own and leave minimal marks.
• For FDM: This one takes a bit more work. I use needle-nose pliers and a hobby knife to get into every nook and cranny. The trick is to cut leaving a tiny bit of extra material that you sand down afterwards, rather than cutting too close and risking taking a chunk out of the mini.

Sanding and Smoothing

Once the mini is support-free, it's time to hunt down imperfections: small marks, blobs, or those notorious FDM layer lines.

My toolkit for this is simple but effective: a set of modelling files and wet-and-dry sandpaper in fine grits (anywhere between 400 and 1000 is a solid starting point). I always sand gently, using circular motions to avoid leaving scratches. Wet sanding, especially on resin, is fantastic for achieving super smooth finishes.

A golden tip: after sanding, grab an old dry brush and dust off the entire miniature. That fine sanding dust is the number one enemy of a smooth, even primer coat.

A Thorough Wash Is Non-Negotiable

This is the step most people skip, and the one responsible for 90% of paint adhesion problems down the line. Your piece needs to be spotlessly clean! You have to remove any uncured resin residue, sanding dust, or the natural oils from your fingers.

My foolproof method is a good soak in isopropyl alcohol (IPA). I submerge the figure for a few minutes and scrub it with an old toothbrush (one you keep just for this — don't mix them up!). IPA dissolves any residue and leaves the surface ready to go. If you want to know more about this wonder liquid, check out my complete guide to using isopropyl alcohol.

If you're using water-washable resin, the process is the same but with water and a little dish soap. Just make sure to rinse thoroughly with clean water afterwards so no soap residue is left behind.

The Final Cure That Locks Everything In

Once your resin miniature is clean and completely dry — and when I say completely, I mean COMPLETELY dry — it's time for its final UV curing session. This fully hardens the piece and gets it ready for everything you're about to put it through.

Don't go overboard with cure time or the resin can become brittle. For a standard-sized mini, I usually give it 3 to 5 minutes per side in my curing station. If you're curing in sunlight, the time will depend on how strong the sun is that day.

With these steps, your miniature is ready for glory. Now let's talk primer!

Choose the perfect primer for every project

Let's talk primer — that magical base coat that changes everything. Diving into the world of miniature primer is like opening a brand new toolbox: there are sprays, airbrush-ready bottles, brush-on options, colours ranging from black to white and everything in between… It can feel overwhelming at first! But don't worry, that's exactly why I'm here — to help you cut through the noise and figure out exactly what you need.

Application methods: spray, airbrush, or brush-on

This is your first big decision. And no, there's no single right answer. In my experience, the best option is the one that suits you, your space, and of course, the mini you're working on.

• Spray Primer: This is the workhorse, the all-rounder. It's fast, lays down an incredibly even coat, and is perfect when you need to prime an entire army or large pieces. The downside? You need a well-ventilated space, like a balcony or outdoor area. And watch out on humid or cold days — you can end up with a grainy texture that's a real pain to deal with.

• Airbrush Primer: For me, this is the premium choice. The level of control it gives you is simply unbeatable. You can lay down ultra-thin coats that preserve every last detail and micropore in the resin. Ideal for competition pieces or character models where you can't afford to lose any detail. The upfront investment in equipment (airbrush and compressor) stings a little, but the results speak for themselves.

• Brush-On Primer: The ultimate lifesaver. Perfect if you're painting in a flat with no outdoor space, for last-minute touch-ups, or when you only need to prep one mini and don't want to set up the full spray kit. The key trick is to thin it down slightly with water to avoid visible brushstrokes. It's by far the most affordable and accessible option.

My hard-won advice: If you're just starting out, a good spray primer is your best friend. It'll give you excellent results without the hassle. Once you've got your technique dialled in and want that extra level of finesse, make the jump to an airbrush. And brush-on primer? Always keep a pot on hand. It'll get you out of trouble more than once.

The psychology of colour: black, white, grey, and beyond

Primer colour isn't just an aesthetic choice — it's pure strategy. Picking the right one can save you hours of work.

• Black Primer: My go-to for dark, dramatic colour schemes. The advantage is massive: any recesses your brush can't reach stay black, creating natural shadows instantly. It works brilliantly for armour, monsters, or grim, dark settings. Just be prepared to apply more coats if you want yellows or reds to really pop.

• White Primer: The ideal base when you want colours to really sing. Yellows, oranges, hot pinks, lime greens — they all gain incredible vibrancy over white. The downside? It's unforgiving. Every unpainted gap will show up clearly, so you'll need to be more careful with your shading.

• Grey Primer: The ultimate all-rounder. A neutral grey is the perfect middle ground. It doesn't deaden bright colours like black does, but it helps define shadows better than white. If you're not sure which way to go, or your mini features a varied colour palette, grey is your safest bet. It works well with everything.

• Coloured Primers: These are a fantastic shortcut! There are more options than ever: reds, blues, greens, bone tones… They let you lay down your primer and base coat in a single step. If you're painting an army of Ultramarines, for example, a blue primer gets 70% of the work done for you. Pure magic!

If you'd like to browse all the available options, head over to the miniature primers section of our store — you're sure to find the right one for you!

To make things even easier, I've put together this handy table so you can decide at a glance which option suits you best.

Miniature Primer Comparison Chart

Use this table to quickly work out which priming method best suits you, your setup, and the results you're after.

I hope this guide has given you a much clearer idea of where to begin. Remember, at the end of the day, the most important thing is to experiment and find what works best for you. Now get priming!

Master primer application techniques like a pro

You've got your mini and your primer ready to go. Time to get to work! Applying it well is a real skill, but don't worry — I've got you covered. I'm going to share all my secrets with you.

Whatever tool you choose, the goal is always the same: get a thin, even coat that preserves every last detail of your miniature. Let's get our hands dirty!

The spray primer trick for a drip-free finish

Spray primer is fantastic for how fast it is, but it can bite you if you're not careful. The secret isn't in the force — it's in the control.

First, shake the can like your life depends on it. Seriously — give it a solid two full minutes so all the components mix together properly. Trust me, this step makes all the difference.

Next, distance is everything. Hold the can about 8–12 inches (20–30 cm) from your miniature. Get too close and you'll flood all the detail with a thick blob of paint. Too far away and the paint will dry in the air, leaving a horrible sandy texture that ruins all your hard work.

Here's the key move: don't just aim and blast. Start spraying before you reach the miniature, sweep quickly and evenly across it from side to side, then finish spraying after you've passed it. One smooth, steady sweep — like a priming ninja.

My golden rule: It's always better to apply two or three thin coats than one thick coat that wrecks everything. Put down one pass, wait around 10–15 minutes until it's dry to the touch, then go again. Patience is your best friend for a perfect miniature primer finish.

The precision of airbrushing

If you want maximum control and a competition-quality finish, the airbrush is your best friend. The game changes here — it's all about thinning ratio and pressure. Every primer brand behaves differently, so there's no magic formula, but here's where I always start.

I generally aim for a consistency similar to skim milk. I start with a ratio of 2 parts primer to 1 part airbrush thinner and adjust from there. A great way to check if it's right is to watch how it runs down the side of the cup.

For pressure, I typically prime at 18–25 PSI. This gives me enough flow for consistent coverage without being so aggressive that it creates "spider" effects or floods the detail. If airbrushing has caught your interest, check out my guide on how to get started with airbrushing miniatures, where I break it all down.

Your passes, just like with spray, should be smooth and controlled, building up coverage gradually.

The brush-on method

Brush-on priming is a real challenge — I won't sugarcoat it — but sometimes it's the only option. To get a clean result without leaving brushstroke marks all over the place, technique is everything.

• Dilute it first: Never apply primer straight from the pot! Drop a small amount onto your wet palette and add one or two drops of water. You want it to flow smoothly without the pigment breaking apart.
• Thin coats: Apply your first coat stretched out as thinly as possible. Don't worry if it doesn't cover fully — that's completely normal! The goal is simply to create a base layer for everything that follows.
• Stippling: For complex areas packed with recesses, dab the brush tip instead of dragging it across the surface. This technique is brilliant for getting primer into every nook and cranny without it pooling up.

It's a slower process, sure, but with a little patience you can get a really solid result. Perfect for touch-ups or those days when you can't use a spray can or airbrush.

The Pro Technique: Zenithal Priming

Once you're comfortable with the basics, you have to try this. Zenithal priming pre-shades your miniature and makes the whole painting process dramatically easier. It's a total game-changer — trust me!

1. Black Base: Start by coating the entire miniature in black. Go for it. Make sure you cover it from every angle so there are no bare spots left.
2. Grey Light: Next, take a grey primer and apply it only from above at roughly a 45-degree angle. Think of it as the late afternoon sun hitting your miniature from the side.
3. White Highlight: Finally, using white primer, do one quick, light pass from directly above at a 90-degree angle. Picture the harsh midday sun blazing straight down.

The result is a miniature with its core highlights and shadows already mapped out before you've even picked up a colour. Any paint you apply on top will look far more natural and three-dimensional from the very first stroke. Your minis are about to level up — guaranteed!

How to Fix the Most Common Priming Problems

It happens to everyone. You finish priming, feeling pretty pleased with yourself, you lean in to admire your work and... your heart sinks. Disaster! Even the most experienced painters have had a primer job go wrong at some point. Myself included — believe me.

The good news is that most of these nightmare scenarios are fixable. Here are the most common issues you're likely to run into when using miniature primer, and how to get out of trouble without hurling your model out the window.

The Dreaded "Sandy Texture" or Grainy Primer

This is without question the number one problem, especially when using spray primer. You coat your mini, it dries, and the surface feels rough and gritty — like someone dusted it with fine sand. Instead of a smooth finish, you're left with something that feels like sandpaper.

This usually comes down to a couple of very specific reasons:

• You're spraying from too far away: If you hold the can more than about 30 cm from the miniature, the primer droplets dry out in mid-air before they even reach it. What lands on your mini is a dry dust that creates that horrible grainy texture.
• The weather is working against you: High humidity or intense heat can seriously mess with how spray primer behaves. The result is the same: a gritty, poorly adhered coat.

How do I fix it? If the damage is minor, there's still hope! Let it dry completely, then very gently sand the affected area with ultra-fine sandpaper — something like 1200 grit or higher. If the whole thing is a disaster, the best approach is to strip it back and start fresh.

I've filled in all the detail!

A classic beginner mistake — and honestly, one that plenty of experienced painters make when rushing too. You get a little carried away with the spray can or airbrush, and suddenly your character's face is a featureless blob, and that beautifully sculpted armour is now one smooth lump. Nightmare.

If you catch it straight away, act fast. While the primer is still wet, grab an old dry brush and use it to lift the excess paint out of the recesses.

My personal trick in these situations — especially with resin — is a cotton swab dampened with a little isopropyl alcohol. I run it very gently over the "flooded" areas to lift the excess paint. Just be careful: go too hard and you'll pull off the entire primer layer along with it.

The paint is cracking or peeling

This is the most frustrating problem of the lot. You finish painting, the miniature looks absolutely stunning, you apply the final varnish coat — and the next day, the paint has crazed or peels off at the slightest touch.

The cause is almost always poor surface preparation.

• Insufficient cleaning: This is the number one culprit. If any fingerprint grease, dust, or — worst of all — mould release agent from the manufacturing process was left on the miniature, the primer won't have bonded properly. The paint is stuck to the primer, but the primer isn't stuck to the mini.
• Primer coats applied too thick: Laying down too heavy a primer coat can cause it to shrink and crack as it dries, taking all your paintwork with it.
• Product incompatibility: Less common when using quality hobby brands like Vallejo, but it can happen — a lacquer-based primer reacting badly with an acrylic paint, for example.

What do I do now? Unfortunately, there are no shortcuts here. The only reliable fix is to strip the miniature completely and start over. This time, make sure you give the piece a thorough clean before anything else. A soak in isopropyl alcohol followed by a gentle scrub is the best insurance policy you can take out on your paintwork.

Frequently asked questions about priming miniatures

Right, let's get into it. After priming hundreds of minis, I've seen the same questions come up again and again in forums and groups. So I've put together this little FAQ to answer them once and for all.

Do you really have to prime a resin miniature?

The short, straight answer is: yes, always. Think of it this way — resin (and FDM plastic too) is incredibly smooth, almost mirror-like at a microscopic level. Acrylic paint needs something to grip onto, a surface with a bit of tooth.

Without primer, paint simply sits on top of the surface. At the first scratch, temperature change, or just over time, it'll chip right off — and all your hard work goes with it. Skipping this step is asking for trouble, and I'm speaking from experience. Don't risk it!

Can I use the same primer for resin minis and filament (FDM) prints?

Great question! And the answer is yes, in 99% of cases. Quality acrylic primers made for scale modelling — like the ones I recommend from specialist brands — are designed to work brilliantly on both resin and the common FDM plastics (PLA, PETG, etc.). These are the ones I've tested across my entire collection, and they've never let me down.

The real hero here isn't the type of primer — it's the prep work. Make sure your piece is spotless, free of sanding dust and finger grease. A thorough clean is far more important than the exact type of plastic you're working with.

Can you brush-on primer and still get good results?

Absolutely. While spray cans or an airbrush give you that ultra-smooth finish with minimal effort, brush-on priming is a completely valid technique. Sometimes it's actually your only option — especially if you live in a small flat or the weather just isn't cooperating.

The key trick is to thin your primer with a little water until it has the consistency of skimmed milk. It's much better to apply two or three very thin coats, letting each one dry fully before the next, than one thick coat. This prevents brushstroke marks and — most importantly — keeps all those fine details on your mini crisp and visible.

How long should I wait before painting after priming?

This is where patience really pays off. Even though spray primer may feel dry to the touch within 15–20 minutes, I'd strongly recommend waiting at least a couple of hours before you start adding colour. If you live somewhere humid or cold, let it cure overnight. Trust me on this one.

Giving your primer that extra time ensures it has properly bonded to the miniature and created a solid foundation. If you rush into painting too soon, you risk your base coat lifting the primer and making a real mess of things. In this hobby, patience is always your friend!

Conclusion

And that's a wrap, folks! I hope this guide has made it crystal clear why primer is your miniature's best friend. It's not an optional extra — it's the foundation that makes all your painting effort look great and last. Remember: clean thoroughly, choose the method and colour that suits you best, and apply thin coats. Nail those basics and you're already halfway there. Now get those minis ready for action!