Don it must be something in the air in florida, i have been having some of the same problems with primer this week, i have been using the featherfill product, and it did the hardening act on me too, 3 or 4 minutes into it it started kicking, luckily it was a cheap gun, so it went in the trash. Yesterday it was drying on the surface before i could finish spraying a line. Hopefully we will have better results this week, now if i can keep from catching the car on fire again ill be in good shape.