water splash marks on newly painted plaster

[carlbd9016]

I have recently painted the new plastered walls in my home but unknown to me i should have rubbed the water splash marks from the wall first, (amazing how many people tell you after) now i am left with patches that wont cover with paint, i have rubbed these down now but every coat i add just leaves these almost bare patches, i am at my wits end and any help would be gratefully accepted!!!

 

[confidentincompetent]

Thse sound like 'fatty deposits ' A result usually of overtrowling, or whatever bonding the plasterer used.. Traditional way is to thin with white spirit a little solvent based undercoat, dab onto the patches and feather out so not to make thick edges. allow to dry. Dont apply too heavy all we need here is a barrier between the bare plaster fat/ and the emulsion. ( you might ned to coat up the spots with emulsion twice before overcoating all again.



good luck..

 

[Richard C]

Could be PVA where he's splashed it around when preparing to skim the adjacent wall; if so, it will cover eventually, you just need to let the intial coats dry thoroughly befeore overcoating.

 

[carlbd9016]

Many thanks for the advice, i will try the method you suggest, again thanks for taking time to make these replies.