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Acrylic sealants shrink, as the water they contain evaporates, by 10-15%.
That's why a gap filled with an acrylic sealant typically ends up concave.
I cannot imagine that the joint will be subject to much if any movement,
and the expansion/contraction of the materials is likely to be very low.If we support Soudal, in return for their sponsorship of cycling,
i would suggest their Plasterboard Adhesive Foam, (low expansion as referenced above),
squirted as far 'in' as you can.
Once it has dried/cured/stopped expanding,
cut of the excess and cut into the foam by a good 5-8mm,
to allow a proper bead of Soudal Fix-All High Tack Polymer Adhesive & Sealant.
This should cure without the concave surface,
and is overpaintable.
mespilus
After the windowframes were replaced in our apartment it became far colder, on close inspection it seems that the windowsill moved a a bit and the sealant doesn't quite fill the gap anymore. Peels right off and proper gale blows through the gap. Can I just fill it back up again with acrylic sealant and paint over it?