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Planning on painting the steel purlins of a carport, that is peeling. I assume the primer and old paint are "oil based" alkyd. I think we will have it sandblasted. What primer should I use on the bare parts. Can I use an acrylic finish coat, if the paint that is left was oil?

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4 Answers 4

I would buy an auto-body primer and then use auto-body paint. You can get a really good look doing this especially if you spray.

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Once blasted. A single coat of red or grey oxide will make a good primer, they are not water proof though, so one or two coats of a good make gloss will seal it, spray to get a smother finish, if not blasting scrap what paint you can, wire brush the rust, and degrease. Then use hammerite, many customer I deal with ask us to use hammerite, but with clean steel, or shot blasted steel basic primers and gloss are easily as good, and a lot cheaper.

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Scrape it, wash it, fully prime it (any quality primer, but metal primer is best there), then paint two coats of a quality water-based paint. You'll be pleased with the result.

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You can apply a water-based finish over old alkyd paint as long as it is thoroughly de-glossed and clean. If it is steel, top quality grey or red-oxide metal primer (as Ben suggests) followed by top shelf exterior gloss paint. Contrary to what I often see/hear, using top quality paint and top quality applicators (brushes and rollers) makes a huge difference in the outcome.

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