B
Barry bp
When i dot and dab i use diluted PVA on brick work.Just asking what anyone else uses as PVA a no no for tiling:smilewinkgrin:
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I had to take all the plaster off a brick wall before I could board it and used diluted PVA to consolidate the dust first.
The drywall addy wouldn't have stuck otherwise.
pva is usually use on browning coat to stop finish plaster sucking to much , it would,nt hurt to put some on brick work just to eliminate any dust
Let's point out what the problem is with it for most of us, it's the fact cement-based products mix with plaster which causes the two to de-bond (a tiny chemical reaction causes the two to sort of cause atom-sized explosions, causing the two particles to not bond). So providing we're not talking about cement on plaster, plaster on cement, I think there's no problem in using PVA.
Sirapite (a gypsum finish)was used on cement backings for a large number of years with no problems
that's what i thought. just splash water up the walls to dampen it a bit.I did the drywall course in Penrith with Gyproc and the stressed you should only dampen the substrate with water when using drywall adhesive.
I have never put any Pva on the wall before dry walling, damping the wall has allways been adequate.
If you put the finish on just as the browning is beginning to set there should no problem with any suction.
Let's point out what the problem is with it for most of us, it's the fact cement-based products mix with plaster which causes the two to de-bond (a tiny chemical reaction causes the two to sort of cause atom-sized explosions, causing the two particles to not bond). So providing we're not talking about cement on plaster, plaster on cement, I think there's no problem in using PVA.
Sirapite (a gypsum finish)was used on cement backings for a large number of years with no problems
i've erased my post. Doug said the same. i thought something wasn't right there with what I said.
I'll just shut up then lol
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