"Any painter worth his salt would know you never use bonding of any kind prior to painting with water based paints especially exterior painting. Bonding is to enable porous surfaces to be sealed and to provide grip for plaster products . As a painter to trade 30yrs and semi skilled plasterer you never bond especially if applied on exterior surfaces and then painted over it will take a winter of cold damp frosty nights and days and come summertime your lovely prep and bonding will blow your paint right off the walls."
"I have used this several times for priming the walls prior to plastering and I must say that this is the best I have ever used, I tried the Evo-stick brand on this batch of plastering, yes it works but not so user friendly as this stuff. Great for wood working etc, all in all it nmight be a little bit more money and you have to buy a bigger tub, but well worth it."
"Of course like all Unibond stuff it's great. But beware do not use it in conjunction with water based paints such as Sandtex as I did. I was painting the outside of a bungalow with Sandtex, and in my prep work cleaned off all flakeing and loose parts, gave the cleaned off parts a coat of unibond and then refilled the different levels of paint woth external pollyfilla. Then again sealed the polyfilla with a coat of Unibond, (BAD MISTAKE) "Go to the bottom of the class" The finished job looked great. But within a year all that I had treated started to blow. After reading the instructions found to my dismay in tiny print "Do not use with water based paints" I did not think for one minute there would be any restrictions on PVA. Thanks Unibond you cost me a lot of money. Could you not print so we can all read it, and one does not have to spend an awful lomg time trying to read all that is on the tub, and put a large warning sign pointing out what it is not to be used for. Please remember Unibond we in the construction industry work mainly outside, and not in the comfort of a heated office."