Ok, I have made a female mould using the EC epoxy tooling gelcoat and then a few layers of standard glass fabric with laminating epoxy.  I had a few imperfections in the mould so sanded them out but I've gone through the gel-coat and into the fibers in a few places.  I was wondering what is the best way to repair this?  Is it possible to add some wax to the gelcoat to make it behave like a top coat for example and use that on top of the affected areas? 
Many thanks, lee.