PVA has been applied to walls which I wish to tile in a 3:1 ratio, Any experienced advice on what/ if anything can be coated over this to enable me to tile the walls securely?
Thank you.
You can't - get as much off as possible preferably all although that will be almost impossible. Warm water, a scrubbing brush and plenty of elbow grease.
where are the tiles? if in the kitchen then i'd be inclined to leave it and just tile.
if shower/bath then you definitely want to remove. or you could reskim the wall - apply pva and plaster when tacky. then use a latex primer once the plaster had dried.
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