USG Easy Sand 90 Joint Compound over mastic?
#1
02-20-17, 07:13 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
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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#2
02-20-17, 07:16 AM
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
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
#3
02-20-17, 07:30 AM
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Thank you for the welcome!
This is w/light off, and flashlight to show the "shine"
This is w/light off, and flashlight to show the "shine"
#4
02-20-17, 09:13 AM
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.
#5
02-20-17, 02:58 PM
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.
I'm sure you did not want to hear but the adhesive needs to come off.
#6
02-20-17, 03:43 PM
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Thank you both for your advice.
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