How to Store Silicone Molds the Right Way
Storage sounds like the most skippable topic in resin — until you pull out a favorite mold after a few months and find it warped, dusty, or creased right through the cavity. How you put a mold away between pours has a real effect on how long it lasts and how clean your pieces come out. It takes almost no effort to do right; it just takes knowing the few things silicone hates.
Lay them flat — silicone takes a set
This is the big one. Silicone is flexible, but leave it bent, folded, or squashed for long enough and it can take a permanent set in that shape. A mold stored with a fold becomes a mold that casts a fold.
So store molds flat, resting in their natural shape, not jammed sideways into a tight box or curled up to fit a drawer. Thin flat molds can lie in a stack as long as nothing heavy presses them out of shape; deeper molds do best sitting upright in their natural orientation. The goal is simple: the mold should be the same shape when you pull it out as when you put it away.
Don't stack heavy things on them
Related, and worth its own line: weight is the enemy. A heavy mold resting on a softer one, or a pile of supplies on top of a drawer of molds, presses dents and creases that don't always spring back.
Give them a little breathing room. A shallow drawer, a flat tray, or a dedicated box where molds aren't crushed together keeps their detail and base flat. Deformed pieces from a deformed mold are completely avoidable, and this is how you avoid them.
Keep them clean, dry, and covered
Two quieter enemies: dust and moisture.
Silicone is a dust magnet — it has a slight grip that pulls in lint, fibres, and grit, and anything sitting in the mold casts straight into your next piece. So store molds clean and covered: a lidded box, a zip bag, or even a cloth over the tray keeps the dust off. Wash before storing if they're dirty, and crucially, make sure they're completely dry first, because a mold put away damp can haze your next pour cloudy and can encourage residue. Drying fully is part of the whole care routine.
Out of the sun and the heat
Last one. Direct sunlight and heat both age silicone — sun can make it brittle over time, and a hot spot (a sunny windowsill, near a heater, a sweltering attic) accelerates the wear. Store molds somewhere cool and shaded, in a drawer or cupboard rather than out on a sunny shelf.
I learned every one of these the hard way with one mold. Left it folded under a heavier one in a warm drawer over a summer — bad on three counts at once: bent, weighted, and hot. It came out with a permanent crease through the cavity and never poured clean again. Now my molds live flat, dry, and covered in a cool drawer, and ones I've had for years still work like new.
It really is that simple: flat, light, clean, dry, cool, covered. None of it costs anything, and it's the difference between molds that last and molds you replace.
Browse my handmade silicone molds for resin.
Short on space and not sure how to store an awkward deep mold? Tell me what you've got and I'll suggest the safest way to keep it.
— Nikolai