My builder has put an oil based mastic down the join between our new single story extension and our house and 3.5 days later it is still very soft, and wet underneath a skin. Is it meant to be like this? How long should it take to set? Also is this material OK to use for this job?
Oil based mastic not drying
- Thread starter bennyboy1
- Start date
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Oil based mastic never actually sets. It forms a skin but stays pliable beneath.
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How pliable are we talking? After 3 days it is still wet enough underneath its skin to stick to your fingers, will it get less pliable? Also is this a suitable sealant to use?
It should stay as it was (beneath the skin) when it was pumped out of the tube.
Not ideal, but it should do the job.
As Woodplank said in your duplicate post, poly sulphide sealant is usually used.
If I don't like it, which I don't, how easy is it going to be to get rid of it? I think if I try and take it out it's going to make a right mess of the surrounding wall, is there stuff I can use to clean up the wall with?
What don't you like about it?
You will need a solvent probably spirit based in order to remove any residue. Turps or white spirits?
It's meant to be soft or elastic. Put some capping on it.
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