I had my first attempt at mould making recently on a door handle surround. It may not have been the best initial mould to make but at the same time it didn't look too complex. The one problem I did seem to have was the gel coat appeared to be too thin. It ran off the sharp edges and left a very very thin layer around these bits. I mixed up the gel coat accordingly but it seemed as though it simply ran off the waxed part. I will post pictures shortly. Perhaps I was supposed to fully submerge the part within the plasticine boundary?