Pva for one coat?

[PhiLyn]

I'm about to use one-coat over painted walls in an effort to make them nice and flat instead of horridly all over the place. Do I need to pva before I use the one-coat like I would with multil? The instructions on the bag don't mention it.
I'm hoping not but expect I do

 

[OuterSpaceHopper]

This link says to use thistle bonding agent(ThistleBond-it) on painted surfaces.

http://www.deepingsbuilding.co.uk/downloads/thistle_plaster_selector_guide.pdf

Seems to be for the purposes of bonding, rather than suction control, or otherwise that chart would say to use the Thistle GypPrime stuff I suppose.

Would the ThistleBond-it be the same as PVA?

I have been wondering the same thing for use of a bare wall that is mostly just reasonably finished multicoat plaster, but with a patch that is down to brick that I was hoping to repair with one coat. PVA the whole thing or just the bare brick.

 

[PhiLyn]

Cheers OSH, I'm glad I'm not the only one that's pondering.

I've found a tech support number for the product so will ask them and let you know.

 

[PhiLyn]

Tech support said use Bondit which is basically pva with sand in it to prove a key. So I went for the 'if in doubt, PVA it' approach.

 

[Crakeman89]

Just recently used one-coat onto a similar background, PVA all the way! can't go wrong...

 

[roy c]

Hope you have a sponge float !!