First I want to say I am a novice. I recently sprayed epoxy primer on my doors of my project and 24hrs later spread a thin coat of rage Ultra Xtra on them. A couple of days later I went to start sanding them and there is a section of the filler that seems a little tacky and I can scratch it pretty easily with my finger nail? It sands ok and doesn't clog 80 grit paper bad but I am wondering if I shouldn't sand it all back off and start over? It is cold here in Michigan but when I sprayed the epoxy the air temp in my shop was 75 degrees and the panel temp was 70 degrees. 24 hrs after spraying I turned the heat down in my shop to 65 degrees and the panel was about 60 degrees when I applied the filler. I have used this filler in the past on this project and never had a problem but it was warmer and more humid than it is now. When i mixed the filler I will add one stripe of hardener for anything up to 4 1/2" puddle for filler and a stripe and a half for 5" to 6" puddle of filler. What are your thoughts. Thank you.