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Unread 03-30-2005, 08:39 PM   #1
BenTheGrate
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Is mastic EVER a good idea?

I've got some heavy polished porcelain tiles, 16x16, to put on my walls. I've encountered a couple of places (including instructions from Densshield) that say to use mastic on the walls for a much stronger bond than mortar.

But I keep reading all these posts about why you should never use mastic.

Any suggestions?

Thanks!

Ben
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Unread 03-30-2005, 08:44 PM   #2
reglilly
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I believe the issue with mastic is that you should never use it in a wet area since moisture can turn the mastic into something approaching it's original paste form. If you're doing a kitchen wall or something, I haven't heard the pros dis mastic for such a use (but keep reading below!). In terms of strength of bond, if you use a fortified thinset, I'm not sure how much more of a bond you would want to have.

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Last edited by reglilly; 03-30-2005 at 09:29 PM. Reason: got it wrong
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Unread 03-30-2005, 08:48 PM   #3
Rd Tile
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Do not use Mastic for this size or type of tile [porcelain], it will never dry out behind them, I would only use mastic on 6x6 or smaller ceramic on dry area walls only and never with stone.
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Unread 03-30-2005, 09:08 PM   #4
MHI
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I don't remember Denshield instructions stating to use mastic. They say you can use mastic or thinset. Denshield has a size limitation for tiles. I think 12 x 12. Also as Rich said, mastic has a size limitation as well.

Mastic has a high grip, but low bond when dry. Thinset has a low grip meaning the tiles will slide down the wall until it sets up, but a stronger bond. Thinset is unaffected by water, mastic will dissolve. DIY's are often told to use mastic because of ease of use. Thinset requires mixing with water, and using spacers between each coarse of tile to support them until dry. Not too much trouble for a job that will last more than 5 years.
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Unread 03-30-2005, 09:15 PM   #5
John Bridge
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Hi Ben,

It's been well said. I personally have no use for mastic.
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Unread 03-31-2005, 09:22 AM   #6
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we call it maystick :-)

mark lauzon
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Unread 03-31-2005, 01:19 PM   #7
BenTheGrate
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You guys are the best! I will avoid mastic like the plague...

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Unread 03-31-2005, 01:27 PM   #8
BTM
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Well here is a use that some guys swear by:

Duck hunters are using it to burlap-wrap their foam decoys, then painting it when dry

For the life of me, I don't know why it doesn't melt away like everyone claims.
So there ya have it...."a good idea"
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Unread 03-31-2005, 05:46 PM   #9
michaelhazuka
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Quote:
Duck hunters are using it to burlap-wrap their foam decoys, then painting it when dry
You are the second person to tell me this...my neighbor is a die-hard duck hunter, and he does the exact same thing to his decoys....one would think that the mastic would degrade in the water. His decoys have lasted over five years with this method...

Go figure
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Unread 03-31-2005, 07:16 PM   #10
surferjoe
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the paint is somehow sealing the stuff is the only logical reason
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Unread 03-31-2005, 08:00 PM   #11
Davy
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Plus, those decoys aren't used day in and day out like a shower is.
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Unread 03-31-2005, 08:03 PM   #12
jadnashua
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It doesn't disolve, it just gets soft on the decoys. Then, you put them away for the season, and it hardens up again for next year?
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Unread 03-31-2005, 08:40 PM   #13
John Bridge
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I repeat, I have found no good use for mastic, but then I'm not a duck hunter, either.

Some of the mastics are tougher than others, and some are even purported to hold up in showers, but the question that should be asked is why. We know thin set can reside underwater virtually forever. Use it.
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Unread 03-31-2005, 10:49 PM   #14
stullis
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There are mastics that can hold up your large tile. You probably cannot get them though without special ordering them. That usually gets expensive.

Ease of use is their big advantage. Down side is they can be easy to misuse as well.
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Unread 04-01-2005, 09:09 AM   #15
BTM
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JOHN !!!!!

If I use thinset on my decoys, the ducks won't see em.

They'll be sittin on the bottom of the lake
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