I, and many of you, have plastic parts that need to be applied to or over the aluminum skin or ribbing of our coaches. Since screws guarantee corrosion and leaks (if steel or stainless steel) I asked my wife for a solution. She came up with 3M 4693H Industrial Plastic Adhesive. I used it on the ABS bumper ends and some reflectors on the sides of the coach. This stuff is permanent and eliminates holes in the skin. Once cured it cannot be removed without destroying the plastic part. I recently replaced the plastic edging around a skylight and just put the new flashing on top of the old holes and completely eliminated screws. Check out the 3M website and I think you will be pleased. We also have another two part epoxy that is structural for replacing panels around the doors and compartments to eliminate the galvanic corrosion problem. I will post the spec on that later this weekend.

3M makes some really good stuff. I love their spray adhesive for doing interior car work, etc.