How to Assemble Resin Model Kits: Complete Guide for All Skill Levels (2026)

Assembling a resin model kit is different from building a plastic kit. The material requires different adhesives, different preparation, and different techniques. This guide covers every step from unboxing to a fully assembled model ready for primer.

Tools You Need

• Super glue (CA): Medium viscosity for general bonding. Thin CA for small parts. Thick CA for gap-filling.
• Hobby knife: A sharp #11 blade for trimming flash.
• Pin vise and brass rod: For pinning heavy parts (arms, weapons, heads on busts).
• Sandpaper: 400 and 600 grit for smoothing.
• Two-part epoxy putty: For filling gaps at joins.
• Warm water and dish soap: For washing parts.

Step 1: Wash All Parts

This is the step most beginners skip, and it causes problems later. Resin moulds are coated with release agent — an invisible oily film that helps the cured resin separate from the mould. If you paint over it, the paint will not stick properly. Wash every part in warm water with a drop of washing-up liquid, scrub gently with an old toothbrush, rinse, and let dry completely.

Step 2: Remove Flash and Mould Lines

Flash is thin excess resin that seeps between mould halves during casting. Trim it away with a sharp hobby knife, cutting away from your body. For stubborn mould lines, use fine sandpaper in one direction. Work slowly — resin is harder than plastic and requires more controlled pressure.

Step 3: Dry-Fit Everything

Before applying any glue, test-fit all parts. Check that joints align, arms sit naturally, and heads face the right direction. If parts do not fit cleanly, gently file or sand the contact surfaces until they do. This step prevents frustration later.

Step 4: Pin Heavy Parts

Super glue alone is not strong enough for heavy parts like arms, weapons, or bust sections. Drill a small hole (0.5-1mm) into both parts using a pin vise, insert a short brass rod with CA glue, and join the parts. The pin provides structural support that prevents the joint from breaking.

Step 5: Glue Assembly

Apply a small amount of medium CA to one surface, press parts together, and hold for 15-20 seconds. Less is more — excess glue creates visible residue around the joint. If you need to fill a gap, use thick CA or epoxy putty.

Step 6: Fill and Sand Joints

Even well-fitting parts may show a seam line at the joint. Fill these with two-part epoxy putty (such as Milliput or Green Stuff), smooth with a damp finger or clay shaper, and let cure. Sand smooth once hardened, matching the surrounding surface texture.

Step 7: Final Inspection

Before priming, inspect the assembled model under bright light from multiple angles. Look for visible seam lines, flash you missed, rough spots, or areas where putty needs further sanding. It is much easier to fix these now than after primer reveals them.

Start Building

Browse our complete collection to find your next project. For first-time resin builders, start with a single-figure kit — they typically have 3-6 parts and can be assembled in under an hour. All kits ship free worldwide with 30-day returns.