How to Paint Your First Resin Model Kit — Complete Beginner's Guide
April 19, 2026 · CastForge Team
So you've bought your first resin model kit. The parts are sitting on your desk, and you're wondering where to start. This guide walks you through everything — from cleaning to final varnish.
Step 1: Clean the Parts
Resin parts come coated in mould release agent — a waxy substance that prevents paint from sticking. Wash all parts in warm water with a drop of dish soap. Use an old toothbrush to scrub crevices. Let them dry completely before moving on.
Step 2: Remove Mould Lines & Flash
Use a sharp hobby knife or fine-grit sandpaper (400-600 grit) to clean up mould lines — the thin ridges where the mould halves met. For delicate areas, a needle file works well. Take your time here; cleanup quality directly affects the final result.
Step 3: Dry-Fit Before Gluing
Test-fit all parts before committing to glue. Resin can warp slightly during casting — if a part doesn't sit flat, dip it in hot (not boiling) water for 10-15 seconds, gently bend it into position, then hold it under cold water to set.
Step 4: Assemble with Super Glue
Use cyanoacrylate (super glue) for resin — NOT plastic cement, which only works on polystyrene. For larger joints, drill small holes and insert brass pins for extra strength. Apply glue sparingly; a little goes a long way.
Step 5: Prime
Primer is non-negotiable for resin. It gives paint something to grip and reveals surface imperfections you might have missed. Use a dedicated resin primer — Vallejo Surface Primer, Citadel Chaos Black Spray, or Tamiya Fine Surface Primer all work well. Apply thin, even coats.
Step 6: Base Coat
Start with your largest areas and base colours. Thin your paint (roughly 2:1 paint to water for acrylics) and apply multiple thin coats rather than one thick one. Thick coats obscure detail and look chalky.
Step 7: Shade & Highlight
Once base coats are dry, apply a wash (thinned dark paint or purpose-made wash like Citadel Nuln Oil) to recesses. This adds depth and shadow. After the wash dries, highlight raised areas with a lighter shade of your base colour.
Step 8: Details & Finishing
Paint small details last — eyes, buttons, insignia, weapon parts. Use your finest brush and steady your hand by bracing your wrists together. Finish with a coat of matte or satin varnish to protect your work.
Essential Supplies Checklist
Here's what you need to get started:
- Cyanoacrylate glue (super glue)
- Hobby knife and needle files
- 400-600 grit sandpaper
- Resin primer spray
- Acrylic paints (starter set of 8-12 colours)
- Brushes: size 0, 1, and 2 minimum
- Palette (wet palette recommended)
- Matte varnish spray
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