I am repainting a pickup truck that will be driven on salted roads in the winter. So far there is no rust on this truck but I have the truck stripped down pretty far so now is the time to prevent future issues. I also welded up about 12 1/2″ holes that someone drilled in the bed so the underside has some raw steel now.
Here are some ideas I had for the underside of the truck:
Wash exposed metal with phosphoric acid etch and paint with epoxy primer and black acrylic enamel
Wash exposed metal with phosphoric acid etch and paint with epoxy primer and then some kind of under coat like POR15
Skip the etch and epoxy primer and paint with POR15
Skip the etch and epoxy primer and paint with the waxy undercoat
Paint with rust encapsulater
I have the materials on hand for option one. I am open to any other suggestions. Time is important because the weather is fading and I have the materials for option 1 but for the other options it will take about a week for materials to arrive from Pennsylvania. However, I can work around most weather issues with IR heat lamps but I have to break things up into smaller batches.