What Happens If I Pour Resin Too Thick?

Why Thickness Matters With Resin

Resins are designed to cure correctly only within certain thickness limits. If poured too thick, the chemical reaction that cures the resin can become overly intense, causing an unsafe build-up of heat (exotherm). This not only raises the risk of the resin cracking as it cools, but may also lead to yellowing or cloudy discolouration.

Common Problems From Over-Thick Pours

• Cracking or Warping: Excess heat puts mechanical stress on the resin, making cracks or deformations more likely.
• Discolouration: Rapid curing caused by too much heat can yield a yellow or cloudy appearance.
• Incomplete Curing: Thicker layers can trap heat or air, leaving the centre tacky or soft even after hours.

Practical Guidance: How To Pour Resin Safely

Always check your chosen resin’s maximum recommended layer thickness. For deep pours up to 10cm, a specialised resin such as “Epoxytable 10-Ten” is best, as it’s designed to reduce overheating. For smaller projects or thinner layers, stick to products with lower pour limits to avoid exotherm problems. If your project needs greater depth than recommended, work in multiple layers, allowing each to cool and harden fully before adding the next.