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Hey /adv/ non-lurking first time poster here. English is not my first language, and I don't know the lingo, so please make this short and sweet
Kind of in a hurry to get a couple of MDF supports ready for some oil paintings. I've painted on MDF for years, and I usually make my own, but recently ran into a problem with two freshly made 90x90cm 6mm boards that a possibly useless carpenter student friend of mine made as a returning favour.
The boards bend in a convex curve, and I'd like to know if I can unbend them by soaking them a bit and pressing down with weights of some sort. How do I go about this? Do I need to use steam, or is warm water enough? Should I soak the convex or concave sides, or both?
The boards will be lying flat on the floor, on the wooden 'stretcher frames' they're glued onto, with convex sides faced upwards.
Do I also need to soak the wooden stretchers?
>tl;dr how to bend MDF using heavy weights
Cheers for any insights
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>>1174272
you have to put something heavy on it so it bow the other way, and then wait
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>>1174279
yeah you need to bow it in the other direction a little bit more
i wouldn't wet it/steam it
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>>1174283
>not wetting it
Are you sure? What prevents it from just popping back up?
>not even the wooden stretchers?
I'll give it a try I guess
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>>1174279
Any idea of how long? Will overnight do?
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>>1174289
no wet, moisture will not help mdf, it will ruin it
how long depends on how bended it is, i would set aside a couple days
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>>1174310
Cheers, I'm aware that water will make the surface rougher, but that won't matter much since I'm sanding and priming with several layers of gesso. I also don't think the integrity will be lost much, since it's only going to support paint. I've put about 20kg on top of each now, and will check in after 40 hours. If it doesn't help, it would be great to know if there's anything I'm not thinking about, other than surface and integrity, in terms of soaking. Also, should I put a lot more weight on them?
Thanks for the advice
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