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Old 10-22-2015, 08:00 PM   #1
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mastic


new thread, i didn't want to jack this thread.
Tile on painted drywall


its was said that mastic is not good. what is not so good about it ?

i was recommended, and used, mastic in my last home, for the tile back splash.
i set a few tiles that i had to remove right away( to much mastic, doh).
and boy that mastic had a tenacious hold on the just set tile.
so, in my very limited experience with mastic, it is a great product.
and i planned to use it when(ever) i do my current BS.

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Old 10-22-2015, 08:25 PM   #2
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Might work OK on a back splash but not in a wet area like a shower.

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Old 10-22-2015, 08:27 PM   #3
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For a back splash mastic IS great---(assuming the tile is 6x6 or smaller)

The shortcoming of mastic is its lack of water stability---the new water based mastics will re-emulsify when exposed to water--as in a shower or tub surround----

And the need to 'dry' as opposed to 'cure' like a cement based thinset--
If you place a 12x12 tile onto a waterproofed backer board--the mastic might take weeks or even months before enough air reached the mastic to dry it--

Mastic is also a lot more expensive than thinset---but that was not your question.
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Old 10-22-2015, 08:45 PM   #4
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ok. i know mastic IS NOT for a wet area. and, in my case, i wouldn't think of using it over backer board.

but what is the problem with larger tiles on primed/painted drywall ?
in my case, i have no idea what i will be putting up. so this is just a learning question.

as far as cost. i have learned that, sometimes, it is better to spend a little more money. as that can save a lot of hassle. = money well spent.
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Old 10-22-2015, 08:59 PM   #5
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You can spend more money if you want, but in this case more money will buy you an inferior product. BUT, for a backsplash I prefer mastic too unless the tiles are large or if they're natural stone and you're not using a mastic that is ok for stone. Easier to use, less or no slip....etc...

Mastic under large porcelain tiles = the mastic will not dry well, it'll act like it's still in the can.

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Old 10-22-2015, 09:15 PM   #6
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ok, thanx fella's.

but i am having a hard time accepting using thinset on wall tiles. my reasoning = . i think of mastic as a glue = its meant to hold things together. i think of thinset as more of a foundation = meant to take more abuse = walked on and weight etc.

old dog, new tricks thing.
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Old 10-23-2015, 06:00 PM   #7
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Quote:
Originally Posted by Fix'n it View Post
ok, thanx fella's.

but i am having a hard time accepting using thinset on wall tiles. my reasoning = . i think of mastic as a glue = its meant to hold things together. i think of thinset as more of a foundation = meant to take more abuse = walked on and weight etc.

old dog, new tricks thing.
It's all about the bond from tile to substrate.
Like the prior masters has pointed out mastic need air to cure, trapping air under larger tiles will prevent it from hardening and if its not harden it won't hole your tile.
Thinsets non modified needs no air to cure.
Your right about structure thinsets are cement base mastic is glue under a pressure test mastic will loose.

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