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PostPosted: Tue Oct 16, 2018 9:04 pm 
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Hi, I apologise for a newbie question but I've got some MDF I want to use as a worktop in the garage. (It's more of a place to put stuff rather than an actual worktop.) I'm not bothered about it looking good but I wanted to seal it to stop spills from cans, cups etc from damaging it so was going to use Rustins MDF sealer. My question is can I just use the sealer and leave it like that or do I have to use something else on it afterwards?


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PostPosted: Tue Oct 16, 2018 10:25 pm 
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Sorry, but in an unheated garage I think that you'll find that your MDF top won't last too long before sagging, sealer or no sealer. Even the green MR variety won't do that well and will start to sag over the course of a damp British winter.

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PostPosted: Wed Oct 17, 2018 10:16 pm 
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Sagging is not going to be a problem. I bought the MDF to sit on top of a hardwood sideboard I've got just to protect the surface. My garage is unheated but I've got a MDF topped workmate that shows no signs of any problems even though I've had it for a few years, so maybe I'm lucky and my garage is pretty watertight?


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PostPosted: Thu Oct 18, 2018 10:53 pm 
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I think you've been lucky so far. MDF is a bit like blotting paper and it can and will absorb atmospheric moisture over time and either sag, or swell, or both. Maybe I see it more because I live and work in the Pennines - and it's wet up here! MDF sealant is only designed to stop paint and other finishes sinking into the surface of the MDF. It is not a water sealer. You'd probably be as well off (or better of) with two coats of undercoat, preferably oil-based.

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PostPosted: Tue Oct 23, 2018 8:55 am 
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Thanks for your help J&K. Sounds like I need to get to work on it and we'll see what happens to it! To be honest I bought MDF over ply or OSB because of the nice smooth surface you get. If I was to replace what would you, or anyone else, recommend?


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PostPosted: Tue Oct 23, 2018 9:44 am 
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If you are just wanting to protect the surface, buy yourself a sheet of hardboard. It's really cheap, hardwearing, moderately waterproof and you can replace it easily as often as you need. You can even cut it with just a knife so it's not even messy.


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PostPosted: Wed Oct 24, 2018 8:16 pm 
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Thanks, I'll bear that in mind.


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