I think you should be ok to paint it, worst case senario you have to paint it for something else, but most wrinkle paint is made for valve covers. as for the heat heat shield and what not...you shouldn't paint it you should go find some headers and just get rid of that crap :-p, but if ya wanna paint it go for it! Then about the thing that is rusted to the brake master cylinder...what year integra do you have, and is it a five speed or an automatic?