Why not indeed - I tend to use whatever I have lying around (browning, mortar ...). But if you're careful with the Polyfilla you won't need to do any other finishing.
Fixing Socket Back-Boxes
Sep 27, 2004
24 Replies
Eh? Pollyfilla that thick will take for ever to dry - and shrink anyway.
Thick enough to use to hold the box in place properly. Or anything other than a thin coat - it dries in air rather than a chemical reaction like mortar.
It doesn't need to be very thick (unless you've made the hole much too big) and the surounding masonry draws the moisture away quite effectively.
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