The Mouldmaking & Casting Forum

Hi, I'm making resin jewellery up in the tropical heat of Darwin and was thinking of switching from the wonderfully toxic polyester, which largely suits my needs except it makes me itch and stinks and is possibly carcinogenic. Polyurethane, from your description, particularly the part about being better for moulds with undercuts, sounds great, but, I'm worried as we have something like 90% humidity right now and I often work on my back veranda when it's raining, whether or not the resin would foam/not set? Also does polyurethane use ptsf dyes, if you get the transparent kind?

CraftCast polyurethane resin sets up in 3 minutes and does not give any problems It can demoulded in 10 minutes and coloured with any of the polyurethane pigments we have illustrated in Tech Tips on our web site.You must not use the polyester PSTF dyes. The clear form of polyurethane resin is not as forgiving and humidity would be a problem. I would suggest trying the epoxy clear resin CrystalCast before trying the polyurethane. Happy casting Stan