I can't help you with your question, but maybe you can help with mine. Where do you get your supplies for mold making? I have been trying to find out how to make molds for years, and would greatly appreciate any info you can share with me. TIA, Frances

morning!
Hadn't been on this forum for a bit,so ddn't get your message.
Most supplies that I use come from a supplier here in BC.I've tried urethane twice now and I'm not convinced that it's for me.I'm currently remaking a critical mold that we use a lot,with ordinary household silicone caulking.Check in this forum's search base for postings about using 100% siilcone(Nobu,or a variation of that name should show up-very good info there!).Easy to use,doesn't stick to your mold master,or to the concrete you pour either!
Cheers from here!
Rick

Hello Frances --- Try the link below. Reynolds specializes in molding & casting materials and is a great outfit to work with. The also have some good basic info on their website. --- All My Best --- Tango

Here is a link that might be useful: Molding & Casting Materials

Thanks for the info. I'll definitely give it a try. (-: