Resin Art

Resin Mixing Ratio Guide

If your resin stays sticky, soft, or won't cure, the cause is almost always a mixing ratio error. This is the single most important technical skill in resin art — and it's easy once you understand one distinction.

Weight vs volume — they're different

Every resin brand specifies either a weight ratio or a volume ratio, and the two are not interchangeable. A 1:1 ratio by volume is not the same as 1:1 by weight, because resin and hardener have different densities. Always check your specific brand's instructions before mixing anything.

Know your brand's ratio

Common art resins like ArtResin use 1:1 by volume, while TotalBoat and Pro Marine use 2:1 by volume (two parts resin to one part hardener). When in doubt, use the measuring cups provided by your brand rather than guessing with a scale.

How to measure correctly

For volume ratios, use graduated cups: fill Part A to the line, then Part B to its line. For weight ratios, use a digital scale and zero it between each component. Combine into a clean third cup, stir slowly for 3–4 minutes scraping the sides and bottom, then transfer to a second clean cup and stir one more minute to catch any unmixed resin on the walls.

Fixing uncured resin

Here's the hard truth: sticky or soft resin after 24 hours can't reliably be fixed once poured. The only real solution is to mix a fresh, careful batch. That's why slow, accurate measuring matters more than anything else in resin work.