rendering over existing masonery paint

Postby thecurtainman » Wed Nov 19, 2008 1:31 pm

we are currently renovating/extending a 50's bungalow and the existing exterior brickwork is painted with some kind of masonary paint. do we need to remove this or can just "scrabble" it to form a "key" of do we just use a bonding slurry
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Postby welsh brickie » Wed Nov 19, 2008 3:06 pm

you need to remove as much paint as possible then paint a pva solution on the walls with a hand full of sand mixed in,when dried the sand will give a bit of grip.
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