No not really, the most important factor would be to prime the mdf with a water based primer, you can if you wish purchase an mdf primer. When mdf is primed the edges tend to feather so you will need to sand or even fill those areas, then after light abrasion between coats it should be ready to accept both undercoat and gloss.
Well if the the units are prepainted, all you would need to do would be to lightly abrade the surface to remove any shine dust off and undercoat ready to apply your gloss. Don't go the waterbased way and always use an Alkyd based system.
Thanks for your reply. I'm not intending to paint them at all, I am buying one to use as it is. But I've heard a few people say this high-gloss is prone to peeling, so I didn't want to buy a unit that's going to be useless in a year's time and wondered whether I ought to buy a matt unit instead.
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