Best way to get the glue (mastic) off the wall from behind glued plastic tiles.?
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I Hate to tell you this But I have been doing this for 20yrs plus and I have tryed it all. You cant do it correctly without removing the drywall. the problem is with anythnig if you get the drywall wet your screwed ( I hate to say it that way) You could always put a skim coat of mastic on the wall to make it smooth and go from there but its not the correct way.
I Hate to give you such bad news... If you need more help drop me a line at kos101@yahoo.com
Goodluck
You will have to scrape it off but it will probably damage the dry wall. Be prepared to replace it or resurface the it.
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