As far as cure time, it lists 16 hours as the full cure time, however it is pretty much rock solid within 3-4 ... (I have been mixing it correctly, it just seems to harden up that quickly.) I would even say it is allot harder than Ultracal 30. The mix ratio is A-100 : 15-B by weight which has been extremely easy to do using a kitchen scale. However I have been mixing it in smaller batches of 200g of A to 30g B to make sure I keep getting the same result with each coat lol. It's been taking me a bit longer to coat because of that, but whenever I get the chance, I'll be going outside today to add some fiberglass to the mold.