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ffm

What primer would be suitable to give water-based external masonry paint good long-term adhesion to cast stone and old oil-based paint?

A few years back I stripped some of our windowsills mainly using a heat gun to soften the old paint and a scraper. The smooth sandtex that I used is peeling off in places. If I redo it, can I prime first to stop that happening again?

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Bobbo in reply to @ffm

Modern exterior paints can cause issues in traditional masonry as they form an impermeable barrier trapping moisture behind them.

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ffm in reply to @Bobbo

Funnily enough I think that was the exact problem with the oil-based paint. Although it hadn't affected the underlying masonry, which is basically concrete. My understanding is that Sandtex is breathable, so it wouldn't cause any issues, it would just be great it if adhered better.

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