try hydrate 80 from bilt hamber, when dry you can paint straight over with top coat no primer nessesary, proven in long term tests by the german TUV organisation which is higher than our BS standard,spray or brush on
100% satisfaction or your money back
its a practical classics best buy beats kurust
1 ltr is £22.95
www.bilthamber.com 01277658899 essex
they also do DEOX C which you mix with water in a tub and put your rusty nuts and bolts in and it cleans them like new
1kg is £11.95
ive used both and fully recommend them
regards