Masonry paint peeling after less than a year

Larry1990 · 27 Feb 2021

Hi guys,

I've been spending some time in the garden this week and I'm pretty miffed to find a lot of painting I did last year is peeling off terribly in places.

I painted a small breeze block wall I did as part of replacing the garage roof and I also painted a previously painted brick wall.

Both surfaces were clean and the previously painted wall was washed with brick acid and thoroughly rinsed and scrubbed. It was previously painted with Leyland masonry paint and I used sandtex masonry paint with the 15 year guarantee. Did I do something wring with the prep or could it be a problem with the paint? Thought I'd ask before I contact sandtex.

Cheers

Larry

Bonni · 27 Feb 2021

Painting masonry is a bad idea at the best of times. The moisture in bricks and blocks needs to go somewhere and sealing it in with paint results in the problem you're experiencing. And what's worse than that, in your first picture, you have thermalite blocks as part of an outside wall, they soak up water likes nobodies business.

Larry1990 · 28 Feb 2021

Hi Bonni, thank you for the info, I've had a bit of a chuckle at sandtex claiming their paint is microporous/breathable this morning. With that being said, painting masonry is still a common practice and the paint manufacturers seem to sell enough to make it worth their while, so is it just a lottery or is there a least worst way of applying paint to masonry?

I've got a thermalite wall on the front garden that i battened and cladded with pressure treated wood (and painted haha) that looks good so I could do the same to this thermalite wall, not so sure about the brick wall as this is a much larger area.

Cheers

Larry

sparkwright · 28 Feb 2021

Maybe it may have helped if the first coat was diluted.

Porous surfaces sometimes need stabilising with stabilising solution.

Thermalite blocks shouldn't be used outside IMO.

See what it says on the side of the tin, then see what Sandtex have to say (it won't be their fault).

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Masonry paint peeling after less than a year

Larry1990

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