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Well, having contemplated the amount of rust to remove, my concern is, would a garage / "in n out" type of place bother doing a thorough preparation work prior to spray a thick coat of whatever they use to cover the crap...
It needs further inspection but my guess is that the rusting isn't yet too critical, the original paint is flaking so it looks bad / "crusty" but when you scrape it away and get to the steel, the damage doesn't seem deep. I could be wrong, but if I'm correct it means that it's not too late to kill the rusting process. If I can be recommended somewhere trustworthy, I'm happy to consider it. I don't have much free time generally so I do value it...
Speaking as someone who has put a stupid amount of maintenance funding into an old car my advice would be to take stock- what’s it likely to cost to fix, what outlay would get something reliable, and what’s the time that you get back from not having to DIY the rust removal worth?