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bluehuw-
I have not. I've had two goes at whatever I was using (which now escapes me - labelled as Decorator's Caulk, but I can't recall the brand). It's been fine elsewhere on funny corners, architrave etc, but this join is a dick. Likely because the hot water tank and pipes inside the cupboard cause 4 seasons in a day.
stevo_com
Might be an ongoing/seasonal thing. Join from our MDF airing cupboard to the wall just fucking REFUSES to stay caulked. Weighing up nuclear options. But it's in mini_com's room so am not too fussed.