A buddy of mine that restores early Broncos (17 to date) warned me against using POR 15 on new metal. He said the first Bronco he did, he stripped the frame down to the bare metal, sprayed it with zinc phosphate, and after that dried he applied the POR 15. After it dried he noticed a spot that he could catch with his finger. That spot eventually led to the product peeling off in sheets. He called the maker, and they told him there has to be rust present for the POR 15 to adhere to. Shouldn't the prep chemicals give a good surface to stick to? Or do you let the metal flash rust before applying the POR 15?
Second question concerns painting a top coat or epoxy primer on top of the POR 15. He's thinking they told him that the POR 15 still had to be a little wet before doing, or else it won't adhere. Sound right?
I'm currently stripping the undercoating off my '65 fender aprons, and am trying to figure out how much I need to get. I'm finding that under the undercoating the sheet metal is still good, can see original overspray and no rust. Only rust is at the welds/under where the seam sealer was applied. His suggestion is to POR 15 over the rusty seams, and spoxy prime and paint the rest. Any thoughts?
Second question concerns painting a top coat or epoxy primer on top of the POR 15. He's thinking they told him that the POR 15 still had to be a little wet before doing, or else it won't adhere. Sound right?
I'm currently stripping the undercoating off my '65 fender aprons, and am trying to figure out how much I need to get. I'm finding that under the undercoating the sheet metal is still good, can see original overspray and no rust. Only rust is at the welds/under where the seam sealer was applied. His suggestion is to POR 15 over the rusty seams, and spoxy prime and paint the rest. Any thoughts?