USG Easy Sand 90 Joint Compound over mastic?

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Old 02-20-17, 08:13 AM
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USG Easy Sand 90 Joint Compound over mastic?

There was a similar thread in 2015, but my question is a little different.

We've removed old pink tiles in our bathroom, and below the tile is what I now believe to be mastic. It is a thick coat, and shiny, but there are some crevices.

The location is in the bathroom, above the shower surround, and I imagine the rest of the bathroom too.

We want to paint, and replacing the wall is not an option. Can I use USG 90 joint compound over the glue/mastic? Will it adhere to the shiny surface, or should I scuff/sand first?

Thank you,
Charlene
 
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Old 02-20-17, 08:16 AM
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Welcome to the forums Charlene!

It's almost always a good idea to sand first! If you can post a pic or two we'd have a better idea of what you are dealing with - http://www.doityourself.com/forum/el...-pictures.html
 
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Old 02-20-17, 08:30 AM
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Thank you for the welcome!
This is w/light off, and flashlight to show the "shine"

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Old 02-20-17, 10:13 AM
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Ideally the mastic or thinset would be removed and then the wall repaired as needed. You might try tapping a corner of it with a hammer to see if it will break loose. EasySand should bond ok to what is there although I would scuff it with some 80 grit sandpaper first.
 
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Old 02-20-17, 03:58 PM
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It is highly unlikely that you will be able to skim coat the adhesive with compound for a surface suitable for painting, there isn't anything for the compound to stick too.


I'm sure you did not want to hear but the adhesive needs to come off.
 
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Old 02-20-17, 04:43 PM
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Thank you both for your advice.
 
 

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