PPG DP-50 Not Curing

67Dart440GT said

Epoxy primer cures slowly. Dp has a 72 hour pot life and will always sand like bubble gum. I'm not sure why you're applying it and wiping it off all the time? Also your original post said you sprayed single stage over it and that wasn't cured after 4 days?? Why would this be the fault of the DP?

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I'm not wiping it off all the time. But when I have to start over, I want smooth bare metal. That way I have less blocking to do.

I suspect that the epoxy (used as a sealer) did not cure right. It was sticky under the single stage. If that is true, that would explain why the single stage did not cure. Of course the single stage could have softened the sealer to.

I have been painting cars for years and have used these exact products with great results. This is the first time I've had an issue like this.