Quote:
Originally Posted by sWe  Besides, cementious materials and poly-vinyl-acetate don't mix. They're simply not chemically compatible.
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Now you see, I just dont get this. I've been in the building game for over 25 years and PVA has been and still is universally used as an admix/sealer/bondong agent for cement and concrete, in fact most products are recommended as such, for example
http://www.palacechemicals.co.uk/WEBSTUFF/4-8.pdf
I've personally used it a thousand times to seal and bond concrete and renders etc. and the stuff is still sound, I know because i still work on a lot of the same houses years after.
Every builder I know has a tub of this in the van and its used constantly, I just dont get the impression that its failing.
Another one that I struggle with is the "cementitous products are incompatible with gypsum products" statement, when gypsum plasters have been recommended and used over sand/cement renders for donkeys years.
I know what has worked for me over the last 25 years and i've yet to be convinced otherwise.