How to Prime and Base Coat Miniatures

Priming is the least glamorous step in the hobby and one of the most important. A properly primed model grips paint, shows every flaw before it is too late, and gives you a consistent starting colour. Base coating then builds the foundation for all your shading and highlighting. This guide shows you how to prime miniatures cleanly, choose the right primer colour, and lay down smooth base coats without hiding the detail you paid for.

Why Prime at All?

Bare plastic, resin and metal can be slightly slick or contain residue from manufacture, which makes paint bead up or rub off. Primer is a thin layer designed to bond to the surface and give paint something to hold. It also:

• Unifies a model made from mixed materials, such as plastic with metal parts.
• Reveals mould lines, gaps and glue marks you missed.
• Provides a neutral base so colours behave predictably.

Some painters skip primer on certain models or use paints that claim to bond directly, but for beginners, priming is the dependable route.

Before You Prime: Quick Preparation Checklist

1. Clean the model with warm water and a drop of washing-up liquid, using an old toothbrush, then let it dry completely.
2. Remove mould lines and flash with a hobby knife or file.
3. Fill gaps with a suitable filler if needed and sand smooth.
4. Assemble the model, or decide which parts you will paint separately.
5. Mount the model on a temporary handle, such as a cork, a bottle cap with blu-tack or a purpose-made holder, so you can turn it without touching the surface.

Choosing a Primer Type

Spray primer

Fast and even. Ideal for batches of models or large pieces. Use outdoors or in a well-ventilated space, away from open flames, and follow the instructions printed on the can. Wear a suitable mask if recommended by the manufacturer.

Pros: quick, smooth coverage, good for armies.
Cons: can clog fine detail if overapplied, weather and temperature affect results, ventilation required.

Brush-on primer

Applied from a pot with a brush. Suitable when you cannot spray, for small touch-ups or for fine control.

Pros: no overspray, can be used indoors with reasonable ventilation, economical for small jobs.
Cons: brush strokes can show if applied thickly, slower for many models.

Airbrush primer

Thinned primer applied through an airbrush. It offers excellent control but needs equipment and cleaning discipline. It is a later upgrade rather than a starting point.

Which Primer Colour Should You Use?

The colour you prime affects how your subsequent colours look.

Primer colour	Best for	Effect
Black	Dark armies, metallics, contrast-style paints	Deep shadows, richer darks, bright colours need more coats
White	Bright colours, yellows, reds, pastels	Vivid, clean colours; shadows need work
Grey	General use, learning	Neutral mid-tone, easy to judge colour and shade
Brown or tan	Earthy, natural subjects	Warm base for leather, wood, skin
Coloured primer (e.g. green, red)	Armies with a dominant colour	Saves coats, but affects all other colours

If you are not sure, grey is a safe place to begin. Many painters keep black and white on hand and mix by using two-tone techniques such as black underneath, then a light dusting of white from above to create a quick highlight.

How to Spray Prime: Step by Step

1. Check the weather and temperature. Very cold, damp or humid conditions can cause a rough, powdery or cloudy finish. Follow the can’s temperature guidance.
2. Shake the can well, typically for a couple of minutes, until the mixing ball rattles freely.
3. Test on scrap. Spray a short burst onto card to clear the nozzle and check the spray pattern.
4. Hold the can at the distance recommended on the label, commonly around 20 to 30 cm, though always follow the can’s instruction.
5. Use short passes. Start spraying slightly before the model and release after you pass it. Do not hold the nozzle on one spot.
6. Build up in light coats. Two or three light layers are better than one heavy coat that fills detail.
7. Rotate the model to reach undersides and recesses, then check from different angles.
8. Let it dry. Leave it for the time suggested by the manufacturer before handling or painting.

If you see a rough, grainy texture, you may have sprayed from too far away. If it looks wet, thick and shiny, you were too close.

How to Brush Prime: Step by Step

1. Stir or shake the pot thoroughly.
2. Use a flat or round brush that is not your best brush.
3. Apply thin coats, moving in one direction, and avoid building up pools in recesses.
4. Allow each coat to dry fully before adding the next.
5. Check recesses and undersides for missed spots.

Base Coating: Laying the Foundation

Once the primer is dry and checked, you can start colour. A base coat is the first, flat layer of colour on each area of the model.

Thin your paint

Straight from the pot, paint is often too thick. Add a little water or medium to your palette until the paint is the consistency of milk. Two or three thin coats will give smoother, more even coverage than one thick coat, and keep the detail crisp.

Order of painting

A reliable approach is to work from the inside out and the biggest area to the smallest:

1. Large areas such as armour, cloaks and robes.
2. Skin.
3. Leather, cloth and secondary colours.
4. Metals.
5. Small details and accents.

This order makes mistakes easier to fix, since you can tidy the edges of one area with the neighbouring colour.

Brush technique

• Load the brush with a small amount of paint and wipe the excess.
• Paint in smooth strokes following the form of the model.
• Avoid scrubbing, which damages bristles and primer.
• Keep a clean water pot to refresh the brush often.
• Work in short, controlled sessions to avoid sloppiness.

Dealing with difficult colours

Yellows, reds and whites are often translucent and can look patchy over dark primer. Options include using a lighter primer in those areas, painting a pale underlayer first (for example, a light orange before red), or applying several thin coats and allowing each one to dry. Be patient; there is no shortcut that works every time.

Troubleshooting Common Problems

Problem	Likely cause	What to do
Primer feels gritty	Sprayed from too far or in dry, hot air	Lightly smooth once dry, prime thinner next time
Detail clogged	Coat too thick	Reduce coats, strip and reprime if bad
Paint beads up	Grease or residue	Wash model and reprime
Patchy base coat	Paint too thin or too few coats	Add another thin coat
Visible brush strokes	Paint too thick	Thin and apply lighter layers
Primer peels	Poor adhesion, no cleaning	Clean thoroughly, test on a spare model

Safety and Practical Tips

• Spray in a well-ventilated area, away from naked flames, and follow the can’s warnings.
• Protect your work surface with newspaper or a cardboard box.
• Store aerosol cans safely and away from heat.
• Keep primer away from children and pets.
• Wash brushes promptly after use.

If you are working in a small flat, our guide to a compact hobby space at home has tips on ventilation and layout.

Miniature Painting for Beginners: Tools and First Steps
Miniature Hobby FAQs: Glue, Primer and Varnish

Frequently Asked Questions

Can I paint directly onto plastic without primer?
Sometimes, particularly with paints designed to bond to plastic, but the paint may rub off more easily and flaws are harder to spot. Priming is more reliable for beginners.

How long should primer dry before painting?
Follow the manufacturer’s instructions. Many primers are touch-dry quickly but benefit from a longer cure before heavy handling.

Should I prime in black or white?
It depends on the final colour scheme. Black gives depth and suits dark models; white is better for bright colours. Grey is a flexible compromise.

What if the primer has filled in detail?
For light problems, gently scrape or brush out recesses. For severe cases, strip the paint with a suitable cleaner and start again, keeping the next coats thinner.

Conclusion

To prime miniatures well, clean them, choose the primer colour that suits your scheme, apply thin and even coats, and give them time to dry. Base coating follows the same rule: thin paint, several light layers, and a sensible order of work. Get these two steps right and every later stage, from washes to highlights, looks better and takes less effort. Prime a spare model this weekend and use it to practise both stages before you commit to a favourite figure.