The Ford Barn

THAIGUY · 12-23-2017, 01:06 AM

Aloha dave
regarding your question on por-15. I used to own a body shop we did some restoration work in the 80's and 90's. At that time the only products available were phosphoric acid base compounds. These were ok and were meant to be applied then neutralized with water and cleaned with lacquer thinner. The primer used was acrylic enamel or polyurethane base primers.

Carbon based lacquer primers were only used as a guide coat over bondo and pretty much sanded off before a enamel base primer coats.

Por-15 came along later around 2000...at least in hawaii. This compound was original ordered as a military specification product. The military had constant problems with rust even on heavy equipment. It is designed to be applied by brush or spray over a surface with rust on it. The product encapsulates the rust and will not let it bleed through. We would always wire brush or sand as much rust away before applying por-15, after drying finish with enamel primer...assuming you're using an enamel top coat.. It does not need to neutralize and much more advanced than phosphoric acid which is an etching agent. Use a dust mask and thin rubber gloves with all paint products.

Hope this helps

12-23-2017, 01:06 AM	#1
THAIGUY Junior Member Join Date: Aug 2016 Location: SATTAHIP, THAILAND Posts: 12	Re: POR-15 Metal prep? Aloha dave regarding your question on por-15. I used to own a body shop we did some restoration work in the 80's and 90's. At that time the only products available were phosphoric acid base compounds. These were ok and were meant to be applied then neutralized with water and cleaned with lacquer thinner. The primer used was acrylic enamel or polyurethane base primers. Carbon based lacquer primers were only used as a guide coat over bondo and pretty much sanded off before a enamel base primer coats. Por-15 came along later around 2000...at least in hawaii. This compound was original ordered as a military specification product. The military had constant problems with rust even on heavy equipment. It is designed to be applied by brush or spray over a surface with rust on it. The product encapsulates the rust and will not let it bleed through. We would always wire brush or sand as much rust away before applying por-15, after drying finish with enamel primer...assuming you're using an enamel top coat.. It does not need to neutralize and much more advanced than phosphoric acid which is an etching agent. Use a dust mask and thin rubber gloves with all paint products. Hope this helps