I have just recently engaged in the world of latex mold making and could use any advice people have. My first mold is a cast of a skull using "Mold Builder" and I have quickly realised that this mold is going to take about 3 weeks to make (20 layers of latex and it is taking about 24 hours for a layer to dry, even when using a hair drier). Am I missing something here? I bought some polyurethan foam from artstuf.com and I think I have a good plan for making foam skulls but I hate to spend 3 weeks and $40 to screw up. Any advice from the masters?