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'Caulk' will inevitably shrink.
Acrylic based sealants cure by loss of moisture, so always result in at best a concave surface.
If the fillet of sealant has insufficient surface area onto the substrates, (typically a bead with a minimum of 6mm), adhesive failure is eventually guaranteed.
Acrylic based sealants can only cope with limited +/-5% movement across the joint.Soudal do a wide range of elastomeric sealants, which when applied correctly, can accommodate+/-25% movement across the joint.
mespilus
Anyone got a recommendation for a really good caulk? The one my builder used on my skirting boards has cracked and shrunk.
Don't mind paying a couple of quid extra for the good stuff.