I agree with 53monster....What conditions will you be using your truck in?
As far as scratches are concerned, I wouldn't worry....
It's unlikely it'll get scratched unless you or someone else isn't careful when working on/around it.
Here's what I did with mine
POR-15 is as tough as old boots and although it's UV sensitive,if it ever sees the sun,it means i've got bigger problems to worry about!

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.