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Soudal decorators caulk
If this is acrylic-based, it will accomodate 10% of total movement across the joint.
If you raked out the joint to be 3mm wide, an acrylic could cope with a maximum of 0.3mm of movement.Did the acrylic stay bonded to the MDF?
The Soudal FixAll Turbo referenced above will have better adhesion, but to the substrate,
ot the painted surface.
mespilus
Persistent crack. I have an MDF airing cupboard and the join between that and the wall, I can't seem to get the hairline crack to stay fucked off. I'm assuming it's just because of the constant heating and cooling of the airing cupboard with the heating/HW going on and off which is causing exapansion and shrinking. So far I have raked out the first cracked and used Gyproc easifill. Came back. Then did the same but with Soudal decorators caulk, thinking that would be more flexible. Came back.
It doesn't worry me in any structural way, it's just ugly. Any ideas? The boundary is also between 2 different paints. The exterior of the cupboard is painted with F&B eggshell and the wall with the same colour but in their modern emulsion. The ceiling (which has the same issue with its join to the cupboard) is Leyland Superleytex emulsion.