Vamp,

As a general rule, fiberglass resin will not stick to plastic very well. Thats why they give you the little plastic spreaders when you purchase bondo. (Bondo is the same basic chemical as fiberglass resin, some just use polyester as the base)

That brings back memories. I had one of those Flitecraft Tempest boats back in the 80's sometime. That thing was FAST. I think mine had a Supertigre 46 in it. Got stupid and tried a .90, way too much motor and was topheavy.

Hope it turns out ok for you.

Pete