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I want to paint an MDF radiator cover with either a satin or a gloss paint. Should I apply to paint directly to the MDF or should I apply a primer first?

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Just like wood you should apply a primer first.

Then undercoat and finally the top coat (or two).

The primer will stop the other paint just soaking straight into the MDF and the undercoat will give "body" to the finish.

Even if you get a "one coat" paint I usually find that it needs two (or occasionally three) coats to get a good, even finish.

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don't forget to buff sand the MDF , prime, and also lightly sand the primer before applying paint with a good quality brush – shirlock homes Oct 23 '10 at 21:04
@shirlock - indeed, but you need to do that when you paint any wood. – ChrisF♦ Oct 23 '10 at 22:13

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