In article ,
Rob Morley wrote:
Eh? Pollyfilla that thick will take for ever to dry - and shrink
anyway.

How thick?

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.

--
*Remember not to forget that which you do not need to know.*

Dave Plowman London SW
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