Scoured the net and found a BBA certificate for Unibond plastering PVA, BBA are the people who certify products as suitable for the building trade according to British building regs and here's what they say:
primer coat on absorbent backgrounds of 1:5 which is allowed to dry, followed by a 2nd coat of 1:3, plastered onto when tacky.
for non-absorbent backgrounds, use neat PVA and plaster while tacky.
SO THAT'S IT FOLKS, as good as it gets, horses mouth, seems like we were all right in some way or another but not quite completely.
It doesn't cover the need for a strong bonding coat on low absorption backgrounds; vinyl emulsion, gloss, Artex &, god help me , tiles! which I have also recently covered !
Whose instructions as tmonkey says, I believe you have that the wrong way around my friend!I am PVAing at the moment and according to the instructions it should be 5 parts PVA to 1 part water 24 hours before plastering then 3 parts PVA to 1 part water about 1/2 hour before plastering.
Hardwall onto thermalite, you’d do better with a good dousing down with a fine spray hose first & then a 5:1 PVA (that’s 5 water:1 PVA) for good measure.However, I am plastering with hardwall onto thermalite blocks at the mo.
AbsolutlyIt is NOT the answer to all problems, and should not be considered so.
But it can be quiet a very good plasterers friendIt should be re-named P.F. (plasterers friend).
Seen all the "Aliens" but only seen the original "Predator", which still gives me a chill on surround; worth a go then is it?Anyway i prefer Alien v's predator.
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