Painting the trunks/engine bay/underside/cabin, POR-15 and leave black? Options

[boxsterfan]

I have been thinking about what I will do with my car in the future when it comes time to restore. On many cars, I see people have appeared to POR-15 (or other) the trunks/engine bay/underside/cabin and then left it black? They then go on to paint the rest of the car as normal (orange, red, white, green, etc...)

I'm not looking to build a concourse winner myself. I am looking to build a car that is restored and protected from rust for as long as possible (another 40 years lets say).

What do people think of POR-15'ing (or any other product) the trunks/engine bay/underside/cabin and then leaving those areas as that? And then (in my case blue) painting the rest of the car as normal?

[sgetsiv]

I have had excellent luck with my hell hole and the exhaust heat shield which I POR 15'd about 4 years ago. No issues whatsoever. I used their Marine Clean degreaser and their Metal Ready prep as well - and I followed the directions completely.

Since I believe and have my own proof that POR-15 works well with the proper preparation, over the past 4 weeks I removed all the tar out of the interior, wire brushed it down to bare metal (or light rust), and coated the floor with POR 15. After drying for a week plus, I applied 1-2 layers of a Dynamat equivalent - Hush Mat - and a layer of Second Skin Luxury Liner Pro on the floor and the firewall.

Test drive tomorrow or Wednesday....