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iam going to tile upon fiber glass shower tub and upon cultured marble, how can prepare the surface and what kind of mastic or thin set i need to use please help me. thnak you very much. :Thumbs:
 

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It really goes against the grain.
As a pro I would say do not do it.

But if you attempt, you will need to rough up the surface to accept the thinset.
 

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tile on fiberglass, as said before, don't. I only see one huge headache to be followed by another.
 

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On the fibreglass I agree with the rest of them: don't do it, you'll be back! On the marble, you're better to take it out, check the underlying structure vis-a-vis deflection, thinset/screw some cbu down, then tile. Don't EVER use mastic in a situation where the tile might experience water. It turns into toothpaste which doesn't hold tiles down well :cheesygri Rich.
 
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