I have been pleased with all products I've used from Restomotive Industries. I began with POR-15 which is the best product ever! Of course I used it with the Marine Clean and Metal Ready, then topcoated with Chassiscoat black. I then used their POR putty, which is pretty neat stuff.
Recently, I have tried their Tiecoat primer and Metal Mask. Both impressed me. The Metal Mask in particular. I was painting the idler arm with it, and I had a hard time telling where the paint stopped and the natural finish was the color was so close.