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Originally Posted by blueosprey90
Sunday - More prepping of floorboards for paint. Grind the rusty floors with a 4"wire brush on an angle grinder, then go down to a 3" wire brush, use paint thinner & a putty knife to remove deteriorated seam sealer, then use a wire brush on the electric drill, 3 different types of brushes depending what I'm trying to clean. With the wire brushes on the drill, the rusty areas turn from black orange to mostly black. The rusty metal is like a skin rash. Then wash with an acid based metal prep - removes some rust, and then converts what is left. Then wipe down several times with a degreaser. I was able to get a first layer of POR 15 on the driver's side floorboards today. I figure about 24 hours of prep work for 1 hour of painting.
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If you haven't reached the painting stage on all of it yet a good test to do is to grind away on top of the treated metal prep surface.
The problem that can happen is that there is often a loose layer on top of yet more rust.
Ideally you need to get to shiny metal.