Kitchen backsplash - tile on drywall mud

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Old 12-29-14, 12:18 PM
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Kitchen backsplash - tile on drywall mud

I have a 2 x 3 ft section of 1/8" mud on my kitchen wall. Do i need to prime this first before putting tiles since the compound for tiles is wet?

One would think this would soften the mud and tiles would fall.. OR everything would just harden nicely...
 
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Old 12-29-14, 12:26 PM
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I'd prime it to be safe .... the tile guys should be along later with their advice.

Decades ago I had a builder complain because I got overspray on the greenboard tub surround. I told him it shouldn't hurt anything but he went and got the tile man to prove me wrong. The tile guy chimed right in and said he didn't have any problem with the paint I got on the greeboard but he did have an issue with the drywall texture overspray
 
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Old 12-29-14, 12:37 PM
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I know you've already got sheetrock mud on the wall but if I have to fill in a low spot or do a repair I do the mudding with thinset. It's doesn't finish smooth and pretty like mud but it's stronger and you don't have to worry about the tile thinset softening it.
 
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Old 12-29-14, 06:15 PM
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I think you will be fine either way, I always use a thinset that is designed for wall tile as they are stickier and there is less sag. Mapie Ultra Lite or LFT would be my recommendations. If you were to prime the mud first, use a new drywall primer so that it soaks into the mud and seals it, not just sets on the surface as a latex would.
 
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