Why Is My Epoxy Resin Not Curing? 11 Causes & Fixes

11 Common Causes

1. Incorrect resin-to-hardener ratio — Measure accurately.
2. Wrong measurement method — Check whether your resin requires weight or volume.
3. Incomplete mixing — Scrape the sides and bottom while mixing.
4. Mixing too quickly — This can introduce excess bubbles.
5. Cold temperature — Low temperatures can slow curing.
6. Too much pigment — Excess colourant can affect curing.
7. Wrong resin for the project — Use a formulation designed for the intended application.
8. Very thick pour — Follow the manufacturer's recommended pour depth.
9. Insufficient curing time — Resin may need more time before judging the final cure.
10. Contaminated materials — Water, oils or other contaminants can interfere.
11. Incorrect product pairing — Always use the resin's specified hardener.

For accurate quantity, use the Fusion Resin Calculator.

For coating and art projects, explore Fusion Vitro 2:1.

For deep casting, explore Fusion Flex 3:1.