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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.
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When I went to Selco ply wasn't much different to mdf pricewise. Not super fancy ply or anything.
Get it cut to size in store and put on the car roof.
Also in terms of swelling, imo it depends what bits you're using it for surely? If it's just the top, sealing it isn't a big thing anyway.
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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.
My workshop bench is partly made from MDF. I made it about 20 years ago and it's lived in an unheated lock-up garage and my garage for all that time. The main structure is made from 2x2 pine, but there's MDF panels to make it rigid, and the top is two sheets of 18mm MDF covered in a sheet of stainless steel. It's still going strong.
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Bobbo
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@Soul
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.