How long does craft resin take to cure (harden)?

Cure time depends on which Craft Resin product you're using, how much you mixed, and the temperature and humidity in your workspace. There's also an important difference between the resin feeling hard to the touch and the resin having actually finished curing. This guide covers both, product by product.

Cure times by product

Product	Working time	Hard cure	Full cure	Notes
Arts & Crafts	~35 min (50g at 25°C)	24 hours at 25°C	~21 days	Max layer 6mm per pour
Table Top	~25 min (100g at 25°C)	36-48 hours at 25°C	~21 days	Surface dry ~6 hours; leave undisturbed 72 hours before kitchen use
Deep Pour	~1 hour	48-72 hours	~21 days	Cures exothermically — see temperature guidance below
UV Resin	N/A (single component)	60-120 seconds under a UV lamp	N/A	Depends on lamp power and layer thickness; cured hardness 86 Shore D
Silicone (mould making)	20-40 min	3-5 hours at 25°C	N/A	Mixed by weight, not volume

Hard cure vs. full cure

These are two different milestones, and mixing them up is the most common source of confusion.

Hard cure is when the surface feels dry and firm to the touch. At this point most pieces can be handled and, for Arts & Crafts and Deep Pour, demoulded.

Full cure (around 21 days) is when the resin has completely finished its chemical reaction and reached its full mechanical strength and scratch resistance. It is not a deadline you need to wait out before using a piece — most projects are perfectly usable well before then — but it is the point where the resin is as hard and durable as it will ever get. Save full cure for anything that will see heavy handling, sanding, or repeated contact, and give Table Top pieces the full 72-hour undisturbed period noted above before putting them near food prep or hot items. We do not currently make a food-contact claim for Craft Resin.

Heat resistance figures (up to 80°C for Arts & Crafts and Deep Pour, up to 90°C for Table Top) describe the cured material once it has fully cured — they're not an instruction to place hot items directly on the surface. Use a trivet even within the rated range.

What affects cure time

Temperature is the biggest variable. Each product has an ideal working temperature: 24-30°C for Arts & Crafts, 25-30°C for Table Top. Below 15°C, cure slows down significantly — warm Part A to around 30°C before mixing if your workspace is cold.

Humidity matters too. Keep humidity under 85% RH for Arts & Crafts and Deep Pour, and under 70% RH for Table Top, which is the most humidity-sensitive product in the range. High humidity during cure is a common cause of a cloudy or tacky finish.

Batch size changes things differently depending on the product. For Deep Pour, curing is exothermic — larger batches generate more heat, so the room needs to be cooler as batch size goes up: 22-25°C for 1-5kg, 20-23°C for 5-10kg, 18-21°C for 10-20kg, and below 18°C for anything over 20kg. Never use a heat gun or torch on Deep Pour — that's for popping bubbles in thin coating layers only, and it can crack or yellow a deep pour. Note that a bigger mixed batch also means less working time, not more, regardless of product.

Step-by-step: checking cure properly

1. Do a light touch test, not a press test. Lightly touch a corner or edge with a clean finger — don't push into the surface, which can leave a mark even on properly curing resin.
2. Compare against the hard cure window for your product in the table above, measured from when you finished mixing, not from when you finished pouring.
3. Check your room temperature and humidity if the surface still feels soft or tacky past the expected hard cure time — cold or humid conditions are the most common cause.
4. Wait for full cure (~21 days) before demoulding anything delicate, sanding, or subjecting a piece to heavy handling.
5. If a piece stays soft or sticky well past hard cure, that usually points to a mixing ratio error rather than a curing-time issue — check how the resin and hardener were measured before assuming you just need to wait longer.

Related articles

• Mixing Ratio — How to Measure Resin and Hardener Correctly
• Shelf Life and Storage — How to Check, How to Store
• How to fix sticky spots of uncured resin