Waterproof over paint

[ajm]

We have moved a shower up against an existing wall. Wall is painted on the top half. Can I prime then waterproof ovefvthe paint? Have sanded it already20240518_122146.jpg

[droog]

We have moved a shower up against an existing wall. Wall is painted on the top half. Can I prime then waterproof ovefvthe paint? Have sanded it already

Pretty sure most manufacturers will say no in their guides, I suspect the main issue is the unknown of how well is the paint attached.


From Dunlop's guide under surface preparation

is free from dirt, dust, oil, paint, curing compounds andany other contaminant materials

https://dunloptrade.com.au/pdf/datas...0Datasheet.pdf

I assume you will also tile over the waterproof ?
That adds more weight that will be trying to pull the paint off.