The cab went off to the dipping shop today. Should be back in 2 to 3 weeks. ( 1960 C20 ) So, after hearing and reading tons of opinions I would like some advice on what I should do with the cab when it comes back. Do I shoot it with primer or sand it or?????

I have heard of horror stories about rust resurfacing years after dipping, etc.... I was considering priming all the areas that will not be replaced with new metal. Do I need to sand it first or ????? advice needed
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1960 C20 Apache Step Side Long Bed
"Swamp Thing" restoration
Story starts in 60-66 trucks