Should I sand between coats of Rustoleum? – Spray Paint Art For Sale

I’ve read reports of people rinsing the floor for 30 minutes in hot soapy water to remove old rust from a finish to keep the powder from drying as well as to add fresh powder. So, I’d just soak the floor in hot water first, then apply Rustoleum, which I’m sure takes advantage of the natural oils and can be added to the sand or used to apply the powder when it dries. Is it too wet for rust to be stripped from the board? Do I need to let the floor dry before I apply? I’ve used this product before, but now I’m wondering whether other Rustoleums will actually dissolve to a depth much greater than the 0.1 microns suggested by the labels. –Mimi.K.

A: Yes, you do; however, most products are designed specifically to be applied to a smooth, even surface, so your sand, in conjunction with a few minutes of vigorous agitation, will work almost entirely. You can sand hard, as I do, for up to three hours to remove the surface imperfections at a depth of 0.1 microns.

The amount of time that will be necessary depends partly on the type of surface and partially on your conditions, but even with the easiest conditions, you still probably do not want to sand too hard; if you do, you’ll have to add about one cup of Rustoleum to the board. On the other hand, even hard surfaces will soften with use, but you can also use a small amount of Rustoleum powder after the sanding to help prevent any surface imperfections from getting in the way. The more abrasive a surface is, the longer you should sand it; you also don’t want to sand too hard during application, as it will eventually remove the surface finish. If you want to sand at a more moderate temperature than this suggested, use a mild detergent like Dettol or Neutrik to help soften the roughness, and try to find a board with a slightly rough surface that can be sanded down in that manner (I used a 6-by-8-foot board that was a good 4 to 5 years old; I haven’t sanded it much these days).

To finish off rust that has been buffed away with regular sanding compound, use a thin layer of Rustoleum powder on a rough, slightly oxidized surface to prevent further buffing and also to add a little bit of a shiny finish to the board surface.

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