Nah...Polyester Resin casting is no secret, it's been around forever. Usually I use Alumilite, which is a urethane resin, but both resins have their best place of use. PR is much harder. Alumilite is not as hard but it is stronger..you trade off hardness which can be brittle at times for strength..well the thing is that when you are turning two different substrates, if one is considerable harder than the other you will end up with a ridge between the two when you sand and polish it. I cast my blanks in silicone molds that I make myself and in a home made pressure chamber. Basically just a quality paint pot that has the feed removed and plugged so it can hold pressure, the pressure crushes any air bubbles in the resin, so the bubbles don't technically disappear, but they shrink down to a size that can't be seen without a microscope. It's a fun hobby.