I have heard people state not to use bondo because it can absorb water. I friggin love the stuff. You can do a lot of coats of bondo in one sitting since it cures so fast. Obviously the theory is water won't get to it if a proper overcoat is put on, but was wondering your thoughts. I did some relatively serious filling and repair to my F31 dagger and rudder using some thickened epoxy as well as some bondo. I covered it with Perfection after a couple layers of primer. All good until you get a nick you can't really see (taking the board out of the 31 isn't difficult, but it isn't easy either)