Sliding Door Lower Rolller - Body Paint

Hi, the rollers have both gone on my sliding door and in the process they have stripped all the paint off where they roll on the bottom of the van. I’ve replaced the rollers but has anyone got any advice on paint? I’m assuming it must be something a bit tougher than a can of Candy White sprayed onto the van. Has anyone used anything like Hamerite to prevent rust? Thanks in advance!
 
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