Thanks for helping, and thanks to all the others who responded.
I think Steve Shoyer found it 45F-95F....
This from Steve....
Their website gives the recommended temperature range as 45-95 F. See
http://www.por15.com/faqs/por15faq.html for details.
> I checked both POR-15 corporate website, and a reseller's
> (http://www.porstore.com/faq.htm) but to no avail. It would be reasonsible
> to assume that similar conditions like many other paints should be present
> - humidity and temperature being the major factors.
> Painting Temperature
> When using latex be sure that the temperature is above 50 degrees F. It is
> difficult for latex to form a film at lower temperatures. With
> solvent-borne paint, be sure the temperature is at least 5 degrees above
> the dew point. If it isn't, water may condense on the surface as it cools
> while the solvent evaporates, causing an uneven blushing effect.
> While most conventional paints must be applied above 55 degrees
> fahrenheit, cold weather paints are designed to resist moisture, frosting,
> and blistering in temperatures as low as 35 degrees
> Corey Sherman
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