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Unread 10-26-2019, 06:53 PM   #59
Moderator -- Mud Man
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Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 32,752
Flatten out the surfaces with thinset and let them set up. Then use a rub stone or rub brick to smooth out the thinset. Thinset isn't easy to get real flat but the stone will grind off any high points. When you get it the way you want it then wipe it with a wet sponge and paint the whole box with Redgard. The extra work to flatten the surfaces will help when tiling, especially with those mosaics.
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