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?

[worn]

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?

You know, i was just thinking about this as i vainly tried to get my por 15 to stick to non rusty metal. You may remember when eastwood used to be king, advertising some sort of glass flake technology. Now clearly they want a rust converter at the first step. Por 15 seems suspiciously like super glue for rust. The most damning thing i can say is they are now suggesting you use a fiberglass material and thickened por 15 to repair missing floorboards. Bondo was in real terms a miracle. But people took it too far. I say cut without pity, and then maybe think about por 15 . Some people say it smells like epoxy, but to me DP-40 smells like victry.