Whats the longevity of the spray on/ roll on bedliners?

Ive been thinking about going over some of my plastic trim and bed caps with it but i don't want a high maintenance deal.

Also i was playing with the idea of doing my roof with it, I'm too short give it a proper wash and wax and I've got some rust up there where it caught a stone. Im just worried my sliding sunroof and rear light and roof racks may not seal properly after.

What do you guys think?

 

As far as longevity of a spray in bedliner: My line-x bedliner came with a lifetime warranty. This being said, it should last...forever

I've never seen bedliner material on a roof, but it sounds like it could work. Bedliner is heavy, which is something to keep in mind.

 

It all depends on how the surface was prepared...

 

This is true, my neighbor who no longer represents rhino lining, didn't prep my bed and the lining peeled out in one complete piece. But the next guy did it right and it has lasted 7 yrs.

 

Can they spray over the plastic bed rails? The reason I ask is that the owner before me had a fiberglass tonneau cover that wore away the paint right beneath these plastic rails. So i would like to have them spray over the rails to cover up the "missing" paint.

 

Well i was referring to the do-it-your-self kits like the Duplicolor brand.
I wouldn't be looking to put a thick layer on the roof just enough to seal it off and prevent rusting. And prevent me having to use scaffolding to wash and wax it. But i do not want it peeling or chunking off.
If i had the spare cash i would definitely be doing s rhino or lineX.