Craft Resin technical specifications

This page lists the current technical values for each Craft Resin product.

Always measure by volume, not by weight. Equal weights are not equal volumes. Measuring by weight is the most common cause of a kit that seems short on hardener, and of a pour that never fully hardens.

Arts & Crafts

Mix ratio	1:1 by volume
Resin viscosity	1,600 CPS at 25°C
Hardener viscosity	up to 1,200 CPS at 25°C
Working time	around 35 minutes at 25°C — shorter for larger batches
Maximum layer	6 mm per layer
Recommended batch	up to 500 ml
Hard cure	24 hours at 25°C
Demould	after 24 hours
Full mechanical strength	develops over about 21 days
Heat resistance once cured	up to 80°C
Ideal room temperature	21–27°C
Maximum humidity	85% RH
Shelf life	12 months at 25°C

Table Top

Mix ratio	1:1 by volume
Resin viscosity	10,000 CPS at 25°C
Hardener viscosity	2,000 CPS at 25°C
Working time	around 25 minutes at 25°C — shorter for larger batches
Maximum layer	3 mm per coat
Surface dry	around 6 hours
Hard cure	36–48 hours at 25°C
Before kitchen use	leave undisturbed 72 hours
Full mechanical strength	develops over about 21 days
Heat resistance once cured	up to 90°C after a full 21-day cure
Ideal room temperature	21–27°C
Maximum humidity	70% RH — Table Top is the most humidity-sensitive product in the range
Shelf life	12 months at 25°C

Deep Pour

Mix ratio	2:1 by volume (two parts resin to one part hardener)
Resin viscosity	1,000 CPS at 25°C
Hardener viscosity	220 CPS at 25°C
Mixed viscosity	600 CPS
Working time	around 1 hour at 25°C
Maximum layer	50 mm per pour; 30–40 mm for 5–10 kg batches; 20–30 mm above 10 kg
Recommended batch	mix in 2–3 kg batches for large projects
Cure	48–72 hours, depending on temperature and mass
Demould	not before 48 hours
Full mechanical strength	develops over about 21 days
Heat resistance once cured	up to 80°C
Maximum humidity	85% RH
Shelf life	12 months at 25°C

Room temperature by batch size — Deep Pour only

Deep Pour cures by an exothermic reaction, and the larger the mix, the more heat it holds. Match the room to the batch:

Batch	Room temperature
1–5 kg	22–25°C
5–10 kg	20–23°C
10–20 kg	18–21°C
over 20 kg	below 18°C

Never use a heat gun or torch on a Deep Pour. Adding external heat to a deep reactive mass increases the risk of overheating, cracking and yellowing. Torching is for thin coating layers only.

UV Resin

Single component — there is nothing to mix. Surface cure: 120 seconds per face under a 6 W lamp, 60 seconds per face under a 72 W lamp, measured on a 15 mm section. Cure both faces; stronger lamps and thinner sections cure faster. Recommended layer up to 2–3 mm per pass — cure thicker pieces in layers, or under a curved or higher-power lamp so the light reaches the sides. Cured hardness 86 ± 3 Shore D. Heat resistance up to 60°C (test method not stated by the manufacturer). Ideal room temperature 21–27°C.

Silicone (mould making)

Mix ratio 1:1 by weight. Working time 20–40 minutes. Cure 3–5 hours at 25°C, or 20–30 minutes at 60°C. Hardness Shore A 15 ± 2 or Shore A 30 ± 2.

Things that are often confused

Working time is not curing time. Working time is how long you can pour and manipulate the mix. Curing takes hours after the resin stops being workable.

Full mechanical strength takes about 21 days. Pieces are usable well before then. For Table Top, the 90°C heat rating applies after the full 21-day cure.

Heat resistance is a material property, not service advice. Do not place hot cookware, hot pans or boiling liquids on a resin surface. A warm mug is normally fine; a pan from the hob is not. Use a trivet.

Bigger mixes give you less time, not more. Working time falls as the mixed volume rises.

Cold and damp both matter. Below 15°C, warm Part A to 30°C before mixing. Above the humidity limits above, the cured surface can cloud — do not cure on very humid days.