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Unread 06-22-2022, 02:12 PM   #1
Audiophile75
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New Tile Project Over Old Adhesive

Hello John Bridge forum.
I am remodeling my bathroom. The house was built around 1960 and the walls are plaster. After taking a few existing tiles off the wall I am not sure what type of adhesive was used to set the old tiles. It looks like yellow tinted glue. I will try to post a picture later this evening.

My father, who remodeled the space 30+ years ago, says he used mastic. I tried a water and vinegar mixture to loosen up the adhesive. But, wetting it seemed to do nothing. I have a 4 in. razor scraper and I am able to scrape the adhesive off with it. However, using the scraper on the whole space is not ideal. After the limited scraping I have already done I can tell there are multiple coats of paint on the plaster under the existing adhesive.

Am I correct in assuming that I need to remove as much of the old adhesive as I can so that the new installation (thinset and ceramic subway tiles) will adhere well to the walls? If so, please suggest the best method to remove the adhesive.
Instead of removing all the old adhesive can I use a tile primer (Mapei's Eco Prim Grip) over the old adhesive before I set the new tile?

Any advice would be greatly appreciated. Thank you.
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Unread 06-22-2022, 04:13 PM   #2
cx
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Welcome, Ben.

This is in the dry areas of the bathroom and not the shower, yes?

The yellow stuff is very likely the old-style organic adhesive (mastic). You may want to call MAPEI and ask about using the Eco Prim Grip over that surface. 800-426-2734

If this is a wet area, we need a bit more discussion.

My opinion; worth price charged.
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Unread 06-22-2022, 05:11 PM   #3
Audiophile75
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See attached for pictures. Is that mastic? It almost looks like construction adhesive to me.

Yes, this is for the non wet areas of the bathroom. The previous renovation removed the plaster from the tub surround and replaced it with exterior plywood. I plan on removing most, if not all, the plywood and using durock in the tub surround with kerdi membrane.
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Unread 06-23-2022, 09:31 AM   #4
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That's the old mastic from back when they could put the good chemicals in it.

You just need to scrape down what you can of it. It's likely you'll scrape the mastic right off and get down to the paper like you see in your photo.

If that's the case, you can install directly over that. Otherwise, you can use one of the bonding primers that a lot of companies have now. Cx mentioned one above. I think Schluter is currently advertising one on the site right now. There are others.

Then you just need one of these.

Name:  qep-floor-scrapers-62920-64_145.jpg
Views: 49
Size:  1.3 KB

https://www.homedepot.com/p/QEP-4-in...182302#overlay
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Unread 06-23-2022, 12:18 PM   #5
Audiophile75
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Quote:
That's the old mastic from back when they could put the good chemicals in it.
Ah, I see. That must be why neither water or acetone softened it up.

I did call Mapei and spoke to a nice lady. She recommended I take off what I can of the old mastic and then use Eco Prim Grip before tiling. Can't wait to become best friends with that 4 in. razor scraper! Haha

Thank you for the replies.
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