18 May 2006
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United Kingdom
Hi all been preparing previously painted pebbledash (will have to try saying that down the pub after a few bevvies ;) ) ready for first coat tommorow but in 3 small places it has been patched up with cement these areas had white powder over them, efflorescence me thinks! so i figure i need alkali resisting primer but is this ok outdoors as all the references i can find on here talk about it indoors

many thanks
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All the pebledash will be alkaline, probably made with lime and cement. I expect the masonry paint you are using is used to it. Brush off what you can of the salts crystals. (I would have said use a wire brush, but if it's pebbledash you might knock the stones out).

Don't use water as you will wash the salts back into the wall and they'll come out later.
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