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Unread 08-23-2010, 04:50 AM   #10
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Join Date: Jul 2002
Posts: 30,274
Cookie, if you have satin wall paint, all you need to do is clean it. Use something like Spic-n-span or any cleaner with Tri-Sodium Phosphate (TSP) in it. You want the surface to be grease-free. The satin finish is fine, as long at the paint is well adhered. If you see the paint flaking off while cleaning it, you should scrape or sand it off.

The old brown mastic can be scraped off with a putty knife or a razor wallpaper scraper. Protect the granite by taping down some cardboard, but really, these tools won't be a problem. Get the surface as smooth as you can so your tiles will lay flat. Yes, your thinset will stick.

I do not recommend a spray-on sealer for health reasons alone. You can pour the sealer into a bowl and use a foam brush to apply it. The foam brush makes it easier to control where the sealer goes.

One of the things you want to accomplish with your test boards is to determine if sealing before grouting is really necessary. So, set 2 sections of tile, and seal one. Grout both sections and judge if the grout stains the tile where not sealed, and whether the grout stays in the pits where you did seal.

Testing is cheap, even if you spend a little more money doing it. You'd hate to make a mistake with your final product.
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