Gen Silver B Rehab/ Paint questions

[TwinsGrill2X]

Hello all. I am re-habbing my 18-19yd old genesis silver b. I have it partially disassembled and there are small areas on the frame that the pant got chipped/scrapped and it has some rust. If I want to spray the frame do I just need to remove the rust and clean the existing paint or take it down to bare metal all over?
Also does any one know what size
/type/thread nuts I can use to replace the ones that hold the aluminum side caps on the  lid?
Thanks in advance.

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