On 8/31/2017 5:20 PM, snipped-for-privacy@snyder.on.ca wrote: ...
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I'm late to the party, but I have some personal experience here. Back in '03 I painted a trailer frame with POR-15 and did not top coat it. (An erroneous page on their web site said that it didn't need to be top coated.)
The POR-15 that is on the part of the frame that is exposed is intact and there is no rusting there, or anywhere. It will likely fail sooner than if it was top coated, but I'm pretty satisfied with the 14 years that I've gotten.
Bob