[TimLiggins]

Several suggestions here to use spray can Hammerite. Don't, I've never managed to get good results from the aerosol cans and the nozzle has always clogged up before the can is even half empty. However, I have had fantastic results by applying Hammerite from a tin with a foam roller. Warm the tin very well in hot water first and work quickly, roll out thoroughly and be prepared to change the roller (gloves on) before the solvent starts to dissolve the foam.