Controlling suction when blending into old plaster (no PVA)

[turpis]

Got a few walls in one room where I've added some sockets and also damaged the plaster behind the skirting board, hence need to re-skim
Rather than do the whole wall (very difficult to do in time as a novice) I've opted to strip the paint off (needed doing anyway), skim up about 1/4 from the bottom and blend the edge in
I've done this on one wall and the blend actually came out really well, but had some issues with suction from the old plaster in a few spots
I spent the morning before dousing it with water a half dozen times, but while plastering there were some areas firming up faster than they should have leaving me with bumps that I couldn't flatten off
Now if I was skimming the whole wall I'd coat it with PVA, but if I PVA on sections of old plaster that don't get covered with new plaster, my understanding is that paint won't adhere well to it
So I was wondering if I could mist coat the old plaster, then blend into it, then mist coat the whole wall again? Would that control suction enough, and would the mist coat stay on the wall when blending, or would it just turn back into watery paint?

 

[Wayners]

Use can use beeline sealer or gardz as both can be painted and no problem with plaster sticking
Waterproof PVA thinned to spec is ok.

It's the cheap PVA that after it has dried, when water or wet plaster has been applied starts to melt and liven up. This type of PVA can react with emulsion. Not always though.

 

[ajrtd]

I would use SBR.

 

[turpis]

Waterproof PVA thinned to spec is ok.

OK to be painted over? Everything I've read says it leads to flaky paint, or is that if it's too neat?

 

[Wayners]

Cheap PVA neat or maybe 50/50 lashed on heavy.
Just livens up when emulsion is applied and reacts although never happened to me.

I've never painted over lashed on PVA though