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Unread 03-17-2015, 06:54 PM   #1
dandking
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Wainscote tiling over painted wall ???

I plan to extend my shower tile job with 12x18 inch porcelain tiles to wainscoat the wall behind the toilet and vanity. Can I tile over the fresh paint on the wall. Thinset is my plan. Backerboard is installed in the shower area and is flush with the rest of the painted wall.
Please advise.
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Unread 03-17-2015, 07:09 PM   #2
cx
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Welcome, Don.

I'll guess your remaining walls are common drywall and say, yes, but first you need to at least rough up the paint with very coarse sandpaper. 36 or 50 grit vigorously applied should work well if you use a good quality polymer modified thinset mortar. Not my favorite installation substrate, but it seems to work all right in dry areas.

My opinion; worth price charged.
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Unread 03-18-2015, 08:49 AM   #3
dandking
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Actually, it is wet plaster painted with eggshell latex paint, Glidden.
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Unread 03-18-2015, 09:02 AM   #4
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Keep in mind that you'll be bonding your tile to your paint. If your paint is not well bonded, your tile won't be, either.

When you initially install your tile to the latex-based paint with thinset mortar you'll soften the paint substantially and your bond will depend upon your waiting long enough for the mortar to cure and the paint to dry again.

My opinion; worth price charged.
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