Should I remove Mastic from shower seams?

Old 07-16-10, 11:50 PM
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Should I remove Mastic from shower seams?

I found a discussion emphasizing the necessity to use a "true" thinset mortar when tiling a shower. Now that I understand why, I absolutely will. My concern is this: I used fiberglass tape to join my cement-board seams and, (before I learned about mastics), I strengthened them with Acrylpro adhesive. Now that I've decided to use thinset mortar, do I need to scrape off the mastic and re-tape the seams, or will covering it with thinset protect it from disintegrating?

Old 07-17-10, 01:32 PM
Join Date: Jan 2006
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mastic should not be used in a shower. Remove it and use a good quality modified thinset to tape the seems and set the tile.

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