Quick question for a plasterer

[LaserTam]

Walls need skimming, they did have lining paper on them with several layers of paint. Lining paper has been removed, but there is some residual wallpaper glue in places which is proving stubborn. If it was just being painted it without skimming, it would need to come off (to give you an idea of how much there is), but if skimming over the top, does it need to be removed or can it remain?

Cheers

[wolfracesonic]

Prime the walls with this bonding agent or similar, leave to dry then skim.

[Gren]

We've had pretty much every room in our house re-skimmed over the years, all after removing wallpaper. We stripped the wallpaper ourselves and as much as we sanded down the walls to get rid of any bits and imperfections the walls were far from perfect.

Plasterers never had a problem and always said jobs at our house were nice and easy with very little prep needed.

[paulwirral]

wolfracesonic said:

Prime the walls with this bonding agent or similar, leave to dry then skim.

This , all day long

[Origin Unknown]

wolfracesonic said:

Prime the walls with this bonding agent or similar, leave to dry then skim.

Sure he shouldn't just PVA it?

Sorry, can't resist!

[B17NNS]

You shouldn't plaster over paper, remove it.

The spread will handle the PVA/thistlebond/blue grit duties as he sees fit.

[Psammead]

B17NNS said:

You shouldn't plaster over paper, remove it.

This. I've seen skim over lining paper many times which has been fine (usually with a Bond-it or Blue Grit applied first as mentioned above). However, I've also seen it done a couple of times where the scraps of lining paper absorb the water in the plaster and swell up enough to ruin the skim finish leading to it being removed / redone a few days later.

Your choice at the end of the day, relatively low risk but a complete pita if it doesn't work.

[LaserTam]

Thanks, I think.

Just to reiterate, lining paper has been removed, there is just some residual glue in places, which is stubborn and would take some effort to remove. Rather not have to waste the effort.

Maybe I will just PVA it...

[B17NNS]

PVA will reimulsify when the wet mulltifinish hits it making the paper wet and then spoiling your finish.

If it's just residual wallpaper paste it's fine. If it's paper take it off.

The spread will handle any potential suction issues with whatever product he prefers. Assuming it's not a troublesome background he'll probably Unibond it.

[astroarcadia]

Old school plasterer would mix PVA with some sharp sand as a key.

New kid on the block would put two coats of Blue Grit on.

Either should be sufficient.

[R1 Indy]

B17NNS said:

You shouldn't plaster over paper, remove it.

The spread will handle the PVA/thistlebond/blue grit duties as he sees fit.

Not always that easy, most 1930's ish houses i come across with cinderblock/lath walls it seems its the wall paper holding it all together!!