Okay so depending on what volume of this product you bought (I bought the smallest quantity) you heat the solid in the microwave for a minute and 20 seconds, smaller quantities require less time obviously, it has a slightly citrus smell and it's food-safe if that matters to anyone. You can also buy a spray called bubble buster, it's supposed to be sprayed onto the piece that you're going to make a mould of and it stops bubbles forming on the part you're moulding.
I made a mould of POTP Blot's head, the pouring of hot liquid over didn't warp or damage it but I wouldn't use this stuff to create a mould of door panels or anything that is a thin plastic and could be warped by hot liquid.