There is an additive called 'gel enhancer' which makes PR go to the gel stage very quickly so that luster powders and other solid additives don't settle to the bottom. The resin gels quicly but the actual cure time is not changed.
When I (used) to use 6 drops per ounce, seems like the resin would gel in about 15-20 minutes and be hard in an hour. I've used less catalyst for so long I may have forgotten the times.
Of course, heat is the key. Ambient temperature is also a factor. The size (amount and thickness) of the pour is another factor. Thicker pours generate more heat and it dissapates slowly. Thin pours take much longer. Sometimes I pour 2 oz of resin (6 drops per ounce) onto a piece of glass and spread it out very thin....takes hours to begin to gel...maybe 6 hoours or longer...12 to 18 to get really hard and brittle.
Hope this answers your question...if not, its good info anyway.
Do a good turn daily!
Originally posted by Skye
<br />On average, what's your ratio of hardener/time to reach a gel stage? I'm looking at mixing some colors, but dont want to miss my window.