In hindsight I would have done a few things differently in the repair of the door channels. First, I would probably have sandblasted the channels. Second, I would not have purchased a pint can of POR 15 for $29.95 to be used in conjunction with naval jelly. Instead, I would have purchased a POR 15 Super Starter Kit Part #SSK ($19.80), which includes enough POR 15 for the job (a half-pint), a half-pint of Marine Clean (which I assume is like naval jelly), a half-pint of Metal-Ready (to etch the metal), some brushes and latex gloves. Several small brushes are required for the job. POR 15 is almost impossible to remove from a brush after use, so count on throwing them away after a single use. POR 15's order number is 800 457 6715. The 3M release agent I used is Part No. 08879, which has superseded the 3M release agent mentioned above in this thread. I would also have used CRC Tool Guard as a final waxy/oily coating over the POR 15 if I had been able to find some locally (but could not).