[quote=Dogboy]The most important factors for getting a good bond are surface prep and cleanliness. You can use epoxy, but personally, for this application, I would use polyester resin. My general rule of thumb is that for internal structural repairs (where you need a really good bond and the strongest resin and where gelcoating is not needed) use epoxy. For external non-structural repairs where you intend to gelcoat, use polyester. Again, if you prep the surface well and keep it clean, getting a good bond should not be a problem. That means cleaning the repair area well to remove dirt. Then sanding thoroughly with 80-150 grit paper. And finally wiping everything clean with acetone.
Personally, I would not use Bondo brand materials. The stuff you get at Home Depot is low quality. Go to a fiberglass supplier and get some decent materials - they will be easier to work with and give you better results in the long run. Otherwise, your approach sounds about right.
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