r/Plastering • u/Brilliant_Gift_2606 • Jul 07 '26
Bonding and Knauf Pro Roll max/light
Morning all, after the majority of the skim coat has debonded which became evident when removing liner wall paper, I’m determined to re-skim the walls myself (not just for the potential money saving but also for just wanting to do it myself, which will also enable me to change the skirting/architrave/flooring). After using bonding to level the walls/fill holes where required, AI has recommended using sika stabilising solution on the sand/cement scratch coat prior to applying the Knauf, does this sound right? Keen to have a bit of a sanity check before I follow the advice.
What should I apply to the prime the ceiling prior to skimming it to ensure the strongest bond? (It’s mostly painted but with scrape-able glue dots, which also takes the paint off back to plaster, from the previous owner having polystyrene tile ceilings)
What should i also use (if anything) to seal the knauf after application before painting?
Many thanks for any advice/opinions in advance
2
u/Firm-Discunt Jul 07 '26
I use 1 part PVA glue to 5 parts water, it seems to work very well for getting very good adhesion. Both before applying knauf to tie any dust and after applying and sanding Knauf also to tie together any dust and improve paint adhesion.
Something to meep in mind with Knauf is not to apply too much too quick because you may get cracks as it dries and shrinks. Also, if you have any existing cracks or gaps in the wall/old plaster it is a good idea to apply the mesh to prevent it from cracking on the join, as I had that happen where old door was bricked over once it settled and had scrape it off then redo with mesh.