-I've never read that 'humidity'
can cause WGDGPS to streak
while its undergoing the 12 hr curing process.
-Humidity has never been factor in any of my applications of WGDGPS.
Now...If the humidity is high enough in the garage, (where
the WGDGPS-ed 2005 Explorer Sport Trac is parked),
to where moisture
is forming and dripping upon the truck...That may be an issue.
If you don't mind...Keep us posted.