Residue on newly painted concrete

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17 Feb 2021
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Hi Folks

I've recently patched up some old sills + external walls with some Cementone render repair stuff and painted over with Sandtex Black exterior.

IMG_3251.JPG IMG_3250.JPG

As you can see from the pics, I'm getting a white residue coming through. Any idea what this is and how I fix it?

Cheers,

Pat
 
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31 Mar 2020
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Has it rained recently? It looks like water marks to me like you get on a car that’s been washed but not dried.
 
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