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Old 12-10-2005, 06:23 AM   #1
dac77
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How long does it take for mastic to dry??

Hi,

I used Hydroment all purpose (or multipurpose) wall mastic to install some
8x8 ceramic tiles onto Durarock backer board located on the front apron of
a bathtub (vertical surface). I let it set up overnight and pulled the rubber
spacers out the next day. A day or two later I noticed the last 2 rows of
tile had actually slid down the wall a little. So I managed to slide them
back into position (with great effort) and replaced the spacers.

There is one spot where the mastic had to be a little thick (~3/8") due
to some wall inconsistencies.

I took a finish nail and stuck it in between the tile and wall where the bull
nose edge is and the mastic is still quite plyable.

It's new construction - the temp has been ~60 degrees.\

I have 2 questions:

1) Does the mastic stay a little plyable after it's cured or should it be rock
hard?

2) How long should I wait before grouting?

Thanks very much.

Dave

Last edited by dac77; 12-10-2005 at 06:39 AM. Reason: Typo
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Old 12-10-2005, 06:26 AM   #2
Davestone
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Dave, yes mastic can stay pliable for days,and turn the color of your grout,so we hardly advise using it,you may have to take them off and use thinset.
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Old 12-10-2005, 12:34 PM   #3
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Yeah, you should have used thinset. Give them a few more days before grouting and then cross your fingers.
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Old 12-10-2005, 01:01 PM   #4
jadnashua
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The stuff stays pliable in the plastic tub for probably over a year. So, depending on how much air movement there is and the permeability of the tile and substrate, it could take a very long time to harden. Note, also that if it gets wet, it can get soft again. I had some on a piece of trim that I washed off after several months - it just re-emulsified, softened up, and washed off without a trace.
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Old 12-10-2005, 01:49 PM   #5
dac77
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Exclamation

Oh this is not good news to hear!

I also used mastic for the tub surround! Are you guys telling me
my whole surround is likely to loosen and come off the wall

I was advised to use mastic by an old tiling guy who now works for
a large local tile supplier. He appeared to be very knowledgable -
there's always a line of people waiting to get his advice.

The directions on the tub doesn't indicate a problem for this usage.

How bad a situation is this??

Would heating the room with hot air help the curing of the mastic?


Thanks.

Dave
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Old 12-10-2005, 02:15 PM   #6
jadnashua
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You'll probably be okay since that doesn't (normally) get wet on a regular basis. It will take a long time for it to dry out. Until that time, things can move. NOrmally it is not used as thick as you installed it and that is part of the problem.

If you wanted to, though, you could probably take those tile off, wash the crud off of both the tiles and the board (but it would be easier to use a new piece of cbu) and redo it with thinset. Thinset, being partly made with concrete should not actually dry; it cures, incorporating the water into its chemical structure. Once set, thinset is impervious to water.
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Old 12-10-2005, 02:31 PM   #7
Tool Guy - Kg
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Hi Dave,
3/8" thick is exptremely thick for mastic. Beyond its limit if you ask me. I think it's going to take awhile before that area is dried. Heating the room will help, but it's going to be hard for that much mastic to dry. I'd check it every couple days with a probe and watch its progression. I'd do like Davestone and Davy and let it dry before you even think about grouting it. If it doesn't want to dry on you, remove them and reset the tiles with thinset. It's really not that bad to replace tiles with gooey mastic. Just messy and time consuming.
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