what is wrong with using it on brackets, bolts , floors, interfenders and such, places that are not on the outside of your car?
Thanks

Nothing, really. But there are other products out there that are better. Have you looked at the POR 15 starter kit? You can get one for 14.95 and its got all you need to do several small jobs.

The big advantage of por over rustoleum is that its incredibly chip and scratch resistant.

You can find it here:
http://www.por15.com/

Jack does por 15 dry as smooth as paint, i read that you apply it with a brush

I have used por 15 on my chevelle, I used it to paint my frame. It looks real good, it won't leave brush marks if you are careful and take your time. I reccomend using those brushes that are a sponge type material thats what I used and it turned out great.

what type of surface will por15 stick to,

I use rusty metal primer and gloss Rustoleum on mine quite extensively. Easy to get, cheap and dries quick. I've used it on many "under" parts of the car. Wheelwells, frame, floor etc...good results, but can chip easily.

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Joe G.
ChicagoChevelle68
Any car past 1972 is just simply transportation, really!

POR is designed to be used on metal. There are some other surfaces it will stick to also. You can paint directly over rust with POR, although you do need to pre-clean the surface and treat the metal with products that are included in the starter kit. They'll include info sheets about all this with your order.

A downside of POR is that you need to topcoat it with another paint since it is not uv resistant. POR makes very durable top coats for this.

POR can get pricey on you if you're using alot. If you're on a tight budget, the rusty metal primer with maybe an expoxy spray paint for better durability may be a workable solution.

Personally, I've used alot of black Krylon for odd pieces and have no regrets.