Can you plaster on gloss paint?

i need to skim a bathroom wall but there are patches of gloss on the wall which will not come off any suggestions ?Can you plaster on gloss paint?
sure you can...give it a go...Can you plaster on gloss paint?
I think you would need to rub the patches of gloss with sandpaper to give the new plaster a key. A coat of upva would also help as it seals any porus surfaces.
rough it up w/ coarse sand paper...





Be Blessed!
I would suggest that you ';key'; these painted patches so the new plaster grips . If you have an elecrtric drill, just do a lot of small holes on these patches. About 25mm deep.
just score through the paint, and rub it down with coarse sand paper, then the plaster should adhere
yep I'd just give it a good scraping to break up the surface a little . Then a coat of PVA ( unibond like the man says) and you should be OK.
Coat the walls in Unibond or rub them down to get a good key
You say patches, not the whole wall. So i'm assuming the areas are less than 500mm x 500mm ?





PVA it a few days before.





Then re-PVA the glossed areas just before plastering so you apply the plaster which the PVA is still tacky.





Done it before to a whole hall and stairs, no problems.
The paint needs to be removed or roughed up (sanded with coarse sandpaper), if it is tight on the wall. If is a point of failure tho
you shouldnt have plastered over it.





as a plasterer, i suggest you wait until it has dried and hope that it will come off, all depends if your talking about a smudge or a lot
Why don't you try to roughen the surface because you will need some grip for the plaster to stick, maybe try sandpaper to get rid of it.
i just finished a job yesterday and faced simular problems


i used rough sandpaper to get most of it off .


i then keyed the surface and added a mixed solution of pva glue and water , let it go tacky then added 2 coats of multi finish plaster ,i dont think i will face any problems
If the plaster really will not come off without extensive damage then you can skim over it but you must provide a ';key'; by roughening the surface of the glossed sections. Then, apply a sealant to the whole are to retard absorption and crack away! Good luck!
Sandpaper it off - or score it heavily with sandpaper to allow the plaster to stick - but, in all honesty, I would rather persevere and get it off!





Another trick is to use Artex instead of plaster - you can get it just as smooth and Artex sticks to just about anything!





If you're going to do it propery though - get it off - it will be easier in the long run and cause less problems in the future