I used wet and dry to remove the rust but didn't take it back to bare metal.
The 121 stuck better if it had a slight covering.
DON'T even bother using a brush apart from in the corners where the roller won't get to as it leaves a horrible finish that I sanded out. You will need quite a few gloss rollers, wilko do a nice set with about 8 for ~£3.00
If you have a spray gun and compressor it would prob work better and be quicker but I'm not sure about cleaning (ask AshG as he sprayed his chassis). At least with the rollers you can throw them away.
Lastly wear disposable gloves, put the pots on some newspaper as unmixed its horribly sticky and doesn't set and mix in a disposable pot (I used a paper drinks cup)
oh and only mix about 200ml (100+100ml) at a time as it gets really sticky by the time you use it all up.
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