For glassing i use a 2 coat resin, 1 coat fiberglass cloth and, then another resin coat. It might be a bit much, but you can sand in between coats. I always prefer safer than sorry. I've also talked to Chris Bryan a lot on his glassing methods and he uses the same method I do. I dont cloth the insides though, and Chris uses the fiberglass mesh for the insides, that stuff is tough to use as its like spreading spaghetti.
Also I use some bondo over all the outside parts to work in detail. Bondo can get heavy though....