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Applied some fine surface filler, sanded back and applied a first coat of primer (valspar stuff I had knocking about. It's got a reasonable amount of solids I think, but they drop out of suspension pretty quickly so you have to keep stirring.
Hopefully this will look ok after a light sand.
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rhowe
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drop out of suspension pretty quickly
That is a common problem with primers. I usually stir the tin really well and then put a small amount in a painters pot where I can stir it a bit with the brush as I'm going along.
Sometimes after an undercoat you can very lightly hand sand some of the 'fluff' you can see there off.
Airhead
The professional answer that you don't want to hear is sanding with a rotary (not random orbital sander) through grits 80 to at least 400 in four stages (i.e. 80, 150, 250, 400).
Then you have a surface very similar to the face of the board.
In fairness you can use thicker primers, filler etc if you have time and not the equipment to sand it effectively. If you are going in that direction I would use an MDF primer like Johnstones one which has a lot of solids in it and then fill with something like Toupret Wood Filler. It's not the best way time wise but you can get there with patience.