Exterior Paint

[potiche]

What's the best exterior paint to use on wet rough cast (circa 1950) garage walls. They are white at moment, presume snocem, but want to have a colour to match the adjacent house wall blocks.

[The Builder]

It'll depend on what's on there at the moment. It's been a long time since I used Snowcem. I didn't even realise that it was still available.

It's a cement-based paint. Unless they've changed the formulation, it can only be applied over previous Snowcem or limewash paints. I can't see it staying put over modern acrylics.

Any idea what's on there now? Is it matt, powdery, flaky?

[carrust]

If it is powdery of flaky you'll have to remove as much as you can with a wire brush or scraper. You then have to use a stabilizing solution prior to painting if the surface is powdery.
Dulux weathershield or sandtex smooth masonry paints are good quality.