Mdf skirting, expanding after painting?

theflyingpig · 7 Feb 2024

First time fitting mdf skirting. It's pre-primed. Cut it all in, then painted with two coats of paint. Come to fix it on and it all needs a mil or two trimmed off!

What's with that?

(obv only discovered after adhesive applied)

blup · 7 Feb 2024

You mean it expanded lengthways? It can and does, cut ends should be sealed.

Diver Fred · 8 Feb 2024

Was it the cheapo stuff or the more expensive Moisture Resistant stuff?

If it's the former it should have been undercoated before cutting - on all sides and fixed as soon as cut to size. Thin coat of PVA on the cut ends helps.

theflyingpig · 10 Feb 2024

Thanks for input. It was sold as moisture resistant, but to my eye is just regular mdf. Came primed.
I didn't think to seal the ends.

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Mdf skirting, expanding after painting?

theflyingpig

blup

Diver Fred

theflyingpig

DIYnot Local

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