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Click that link Chis put up. That will cover you for 99% of the jobs. One caveat: To avoid possible damage to the wall, you might want to skip the Paper Tiger tool in favor of some really coarse sand paper.

All you need to do is allow water to penetrate the water proof layer, and in most cases a few passes with some 40 or 60 grit will give you enough for the water to seep in.

The Paper Tiger will tend to perforate the drywall paper and then you risk getting water in the facing paper and bigger problems.
 
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