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I have an ugly black concrete floor in the laundry and I would like to paint it white over the top.

I have a few questions.

What different steps do you take when you are painting over a color rather than painting over unfinished concrete. And is white over black more difficult.

Is this considered a difficult job, should I hire someone? (I am a novice)

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White will look great when it done, but after a while it will not look so nice after some foot traffic. I'd suggest going with a slightly darker color to help to hide the long term foot traffic. –  Jon Raynor Mar 5 '12 at 14:50

1 Answer 1

up vote 7 down vote accepted

This should be a fairly easy project for you. The first step it to determine, if possible, if the existing paint is an oil or latex based paint. If you have the bucket that the old paint was in, you're in luck. Otherwise, it is hard to tell even though a trained eye may be able to tell. Regardless, using latex will be safe over either oil or latex (oil over latex will wrinkle and peel almost immediately and make a mess).

Since black will be hard to cover with one or two coats of white, I'd use a good blocking primer like Kilz or any good color block. Two quick coats of primer should be a great backer for white over black. Then just roll on your good quality, hard finish floor latex enamel. Probably two coats will do the trick. Be sure to clean the existing black finish well, and if possible, sand lightly just to rough up the surface a bit. This will help assure a good bond with the primer. Good luck.

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Thanks heaps for the answer, very informative and exactly what I'm after. In regards to sanding lightly, what would be the best way to do this? –  uriah Mar 4 '12 at 15:23
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depends on the size of the room. If it is fairly small, a pole sander with 100 grit would be fine. A power sander is going to make a lot of dust, so if you can get by doing it by hand, all the better. Be sure to vacuum up all the dust and start very clean. –  shirlock homes Mar 4 '12 at 21:26
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I should have said however, if you use a power sander, like a small DA, keep the speed low, wear a dust mask, and if you think the paint is pre 1978, do a lead test before any sanding. –  shirlock homes Mar 4 '12 at 21:28
    
Thank you for your outstanding advice! –  uriah Mar 4 '12 at 23:11

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