Rod wrote:

I want to use a mastic gun and cartridge of filler - no idea if that is
a good idea or not, but I couldn't find any. I dare say the various
Gripfills and similar would be usable - but would probably shrink and
stink and go the same way that yours did.

If you want to go this route, then filling most of the depth with a
solvent gripfill product, letting that go off, and then finishing with a
surface filler would probably work. That way you can fill the depth with
something that will go off fast enough but shrink a bit, and then using
something non shrinking for the last bit that gives a good cosmetic finish.


--
Cheers,

John.

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