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I have some MDF that was sanded with a random orbital sander with 320grit

Will polyurethane make a decent bond to this?

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Sure, I see no reason it wouldn't if the surface is clean and dust free. –  shirlock homes Apr 9 '13 at 8:55
    
ok. I ask cause I keep reading that it needs to be a rough surface...120 grit... to have more surface area to bond. –  Vigrond Apr 9 '13 at 15:26
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I don't know where you got the idea to use such a coarse sandpaper. You can urethane on the smoothest of surfaces. As long as it is clean and dust free, it will bond fine. –  shirlock homes Apr 9 '13 at 20:03
    
thanks! hard to know what you're reading is the truth or not sometimes -_- –  Vigrond Apr 9 '13 at 23:10
    
be sure to sand between coats of urethane with super fine paper, 220 or finer for a nice smooth finish. Be sure to remove all dust before putting on the next coat. –  shirlock homes Apr 10 '13 at 0:21

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