I know POR recommend using their 'Metal Ready' spray.
(I suppose they would,as it's another one of their products!):D

It leaves a nickel plate look on clean new metal and seems to give a good 'key' for the POR-15.
I've used it extensively on mine and have been pleased with the results.
Just remember about the UV sensitivity.It should be O.K. on the underside though....


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.