POR15 is good $hit, im not saying you should paint over rust but its a good product.
I just had my 1000 done. It cost 2k and its a nice job done in a booth. They used debeers paint which im really happy with. Its a sweedish paint. I also got told PPG is ok. They told me a few others but can't remember. I do remember they said no protec or septone.

Don't paint it outside use a booth
Don't use cheap products
Don't use rattle cans
Don't paint it your self unless you are confident and practise

If you fu#k it up nobody will want to help you and it will cost heaps more to do right next time.