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I wouldn't use it for that. The MDF will absorb water from the air, it won't blow but it will over time become more flexible and sag. If you really have to use MDF it would need to be sealed with paint or polyurethane varnish.
Edit - ply has come down in price of late as long as you don't buy birch or from somewhere like Wickes where it always has been eye wateringly expensive.
Anyone have issues using 18mm MDF for garage storage? I've got some time off in a few weeks and am planning to remake my garage workbench to make it more useful, including drawers for dewalt & festool systainer boxes.
Garage isn't insulated so wondering if, over time, MDF will swell with moisture changes or am I just overthinking it?
Really want to avoid ply as it's still so fucking expensive.