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  • 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?

  • I'm not sure but Gardz from zinnser might be right for that. They have a few different primers that could be an improvement on what you have. These days I use all coat from them for exteriors. It's held up well on where it was put on 5 years ago, that's as long as I've been using it though.

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