Hi Andy, well I am no paint expert, but I am on my fourth shell off restoration, so at best I can give you my experience thus far. I am not familiar with the POR-15 products but they certainly do have a following and a number of respected retailers your way endorse it. When bringing my respective trailer chassis back from the brink, they were sandblasted and etch primed as part of a 3 part epoxy regime, with extra,extra final coats ( different colours in some cases ), to exposed areas such as wheel wells, bumpers and drawbars. I just held on to the fact that I wanted the trailers to be here in another 50 years and that makes most decisions with regard to quality and cost more easy to deal with. Hope I have been of some help ,
Happy painting.
Pete
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