3M Marine Premium Filler

Great product. Very easy to use, even for a novice. No need to get into the complexity of fiberglass repair with this stuff -- just mix with the hardener, layer it on w/ a putty knife, fair, and off you go. Dries very quickly, easy to sand, just an overall great product.

Make sure this is the last thing that goes on; you don't want to apply a resin or glass over this. This material really does a great job finishing your work; shapes easy, holds tight and you can modify your available use time enough for broader applications.