White Crystal
White Crystal
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Why does the salts come out on some gypsum plaster (that white crystal stuff)?
I do a bit of plastering and some times I get the salts come through and blow off any paint, Are they painting too soon ? though it only comes up "here & there" and then it happens on un-painted as well, is it damp in the walls? How do you best get rid of it and prevent it coming back?
Hi,
I'm a plasterer and have come across this a few times and been asked to repair it. The cause could be several things, the most common being damp. Other less common causes could be unwashed sand being used in the original backing render. The way I deal with it is as follows. First of all, take the contaminated plaster and backing coat off (down to the brickwork). I then get my local damp preservation guy to check the brickwork for damp. If it's damp, it needs to be treated professionally. After treatment you have to wait for any damp to escape from the brickwork (usually around 3 months!) After this period, brush off any remaining signs of salt and use a salt inhibitor (usually in liquid form and brushed on). You can now start to apply the backing coat. I use either a renovating backing coat or "Thistle dry coat" Once this has been applied, you can finish off using Thistle multi finish the day after. When all is fully dry, it can be painted using a matt emulsion watered down to about 10%. If the problem is just contaminated backing coat and not damp, do exactly the same as above but without the damp preservation process.
Hope this helps...
White Crystal[橋本みゆき][Purple_software]


US $7.95



































































