Hi Ron. I have tried two other rust converters:
This is the website for POR-15:
I have also used Plasti-Cote's rust converter. It is available at Advance auto parts stores (and others). This person can offer advice if needed:
So far both seem to work well. You remove loose rust, clean the part, and coat it. It leaves a black, plastic-like surface to paint on.
Good luck and have fun. I have only one H, but it has enough projects to keep me busy whenever I have time to work on it...............