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Hi guys. i painted my window sills with sandtex masonry paint on my
window sills. Now it has flaked and just peeled off. Why is this? I
did paint over gloss, but should this have affected it?

Yes, of course it affected it! It's intended to be painted onto masonry,
not gloss paint.

Masonry is textured and absorbant and rough and dimply. Even my
glosswork is smoother than that.

--
Skipweasel
Pay no attention to that man behind the curtain.