Tiling over vinyl paint? Min. prep required?

Joined
30 Mar 2012
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Monmouthshire
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United Kingdom
Rendered and skimmed wall, vinyl paint.

What is the vest prep? It doesn't seem like a good surface to tile, maybe a good scoring with el diablo or a plasterers roughing out saw? Maybe bolster the skim off?

What's the usual way to proceed?

Thank you

Dain
 
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