I have some stuff called "Splash Zone Compound". I used it to build my nosecones on my racing lower units, and the leading edge was sharp as a good knife. Never had a single chip in the stuff. It is harder than the aluminum on the gearcase. It is sold in two parts, a compound and a hardner, one is yellow the other is black. When mixed it turns OD green. When you apply it, you can wet your hand and smooth the surface as smooth as glass, it is sandable, cures in 24 hours. It bonds by physical adhesion, so rough up the area very good with 40 or 60 grit sandpaper, then clean with brake parts cleaner, NOT CARB CLEANER, carb cleaner contains oils brake parts cleaner does not, and apply. It even dries underwater. Shoot me a pm if you are interested, I would trust this stuff to patch almost anything.
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