When I was younger Hammerite was great. Something must have changed as I don't find their products as good. I always clean up with wire brushes on a drill or those ploy wheels first. Here's an example. I did a previous Rover with Hammerite and then waxoyl. Took me a week to prep it all to my satisfaction first. My daily Toyota got a quick clean some red oxide overcoated with spray cans from Poundland. The Toyota faired much better despite being in much the same starting condition!
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