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How do you remove black mastic from sheet rock

How do you remove black mastic from sheet rock


Old 02-23-17, 06:39 PM
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How do you remove black mastic from sheet rock

So my bathroom had these massive mirrors on the wall which i removed.

im guessing this is black mastic on the sheetrock. Im thinking heat gun w/ scraper to remove.

Any better ideas?

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Last edited by branimal; 02-23-17 at 07:15 PM.
Old 02-23-17, 07:51 PM
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Probably the fastest way is to cut through the paper only in a football shape and peel it off . Then you can skim over the footballs, sand, prime and paint.
Old 02-23-17, 08:24 PM
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I wouldn't use a heat gun, it will just smear it all over. Use a chisel or a window scraper... scrape the paper off like Larry said. You will have to patch and sand the wall any way you look at it.
Old 02-23-17, 08:48 PM
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After scraping or cutting the adhesive out, prime the wall with Zinners Gardz before skimming.

The primer will adhere and seal the raw paper and keep the mud from bubbling or having pin holes.
Old 02-24-17, 03:44 AM
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prime the wall with Zinners Gardz before skimming.
Important step! Either Gardz or an oil base primer, not just a latex primer. This prevents the moisture in latex paint/primer and the j/c from loosening the surrounding paper's bond with the gypsum. You only need to prime the affected areas.

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