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Old 03-04-2004 | 01:16 PM
  #11  
kdheath
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From: Rochester, MN
Default RE: Photochemically Reactive

In this context, it means that the chemicals that evaporate from it contribute to smog.

ORIGINAL: C_Watkins

I looked on the web a wee bit more today... and found this:
http://www.paintideas.com/glossary.asp?wordid=974
(On a google for: definition "photochemically reactive". There were lots of hits)

So unless the product label definitely mentions leaving it in (or out of) the sun to cure,
I'd say it's simply more of an EPA-ism than anything else.