Techniques
Prep
Prep turns parts straight off the sprue or out of the bag into something ready to build: clean edges, no mould lines, nothing missing.
Kits and minis
Clip parts from the sprue with sprue cutters, not scissors or a knife. Cutters leave a cleaner, lower-stress cut that is easier to clean up.
Scrape or sand away the mould line left on most parts. A fingernail run along the edge will usually find one you missed by eye.
Wash resin parts in warm water with a drop of washing-up liquid before handling, to remove mould-release residue that can stop paint and glue from keying properly.
Bench tip. Clip slightly away from the part, leaving a small nub, then shave the nub flush. Cutting flush to the sprue in one go risks digging into the part itself.
Brick builds
Check every part against the instructions as you go, especially printed or rare pieces. A missing part is far easier to source or substitute before you are deep into a build.
Have a visually close substitute ready for a missing part, such as a different grey or a similar plate, so a stalled build does not sit half-finished for weeks.
Separate stuck plates with a proper brick separator, not a knife or screwdriver. Both can slip and mark the studs or your hand.
Bench tip. Keep a small tub of odd spares from old sets; it is often the fastest fix for one missing piece.
Technique guides
How to remove mould lines from kits and minis
Mould lines are the thin raised ridges where the two halves of a mould met. Here is how to find them, scrape them off without damaging detail, and when to reach for a file instead.
Side cutters for modelling: what matters and what does not
Sprue cutters are the first tool most builders buy. This explains the difference between ordinary double-blade cutters and single-blade nippers, and the cutting method that matters more than the tool.
Sources
- Sprue and Brush: Single vs Double Blade Nippers . Confirms: Double blade pinches and can stress-whiten; single blade shears against a flat anvil; single blade can chip on thick material . Checked 31 Oct 2026.
- Gunpla Hangar: The Two-Cut Method . Confirms: Cut away from the part first, then trim the stub flush . Checked 31 Oct 2026.
- Mini Paint Lab: How to Remove Mold Lines From Miniatures . Confirms: Back of blade at about 90 degrees; light passes; needle files; 400 to 1000 grit; leave a stub when clipping . Checked 31 Oct 2026.
- Wargaming Tradecraft: Getting Started, Removing Mould Lines . Confirms: Scraping versus slicing; files as the safer option . Checked 31 Oct 2026.
- Goonhammer: Hobby 101, Clipping and Model Preparation . Confirms: Mould line remover or back of knife, not the sharp edge; inspect every angle . Checked 31 Oct 2026.