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I used a high quality copper type weld thru primer (German and expensive) on metal that was going to get very hot from nearby welding. I believe I sprayed in inner parts of the front struts with this stuff. Rust preventative paints such as POR15 are of course good for old metal with surface rust. New metal can have either an epoxy primer of self etching primer sprayed on them. Most of the undercarriage of my 356A got painted with an epoxy primer then an industrial metal paint from General Paint. The car lives a pampered life now and I am sure it will never rust again.
Also, make sure you cut the bad metal back to good solid metal or you will never get the patch welded in properly.
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