On Sat, 30 Sep 2017 19:01:11 -0400, Bob Engelhardt
wrote:

On 8/31/2017 5:20 PM, wrote:
...
Por 15 is not UV stable. It has to be topcoated.
...

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.

Did you tell them of this, and did they offer a quantity of top coat
(or top coat and por15) to make up for the confusion? That would be
cheap advertising and extremely good customer relations to do so for
anyone who purchased product in that time frame, despite no known
losses by the consumers. It would lock in consumer loyalty as well as
begin free advertising by said consumers to future consumers. Just
curious. At the price they're getting for the product, they can
afford it, too.

--
Stoop and you'll be stepped on;
stand tall and you'll be shot at.
-- Carlos A. Urbizo