I have used Eastwoods Metal to Metal,aluminum with epoxy. After all parts were blasted and preped with acid I used this product over all weld seams and anywhere I thought moisture could penetrate to the backside of were I would later apply plastic body filler. It sanded similar to filler. I then coated all with epoxy and then 2k primer. Because of a flood the truck had to be moved outside for a week and sat in the rain. It has now been several months and the truck is back in the garage were I plan on getting to work filling and priming, I can find know areas that have bubbled or show signs of rust. Very happy with the Eastwood product.
