Do you add water proofer to render top coat?

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Jun 4, 2026
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Hi All,
I’m at the point of rendering a new pond, but alittle confused regarding water proofer to top render coat prior to painting with a water based pond paint.
I’ve heard some say no proofer to be added others say add it, but if added, that would prevent paint from penetrating into render, allowing it to possibly peel.
So just need a quick reply to say add it or leave it out!
Many thanks
Mark
 

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