[HuggerCST]

I have a related question- I have used featherfill sprayable filler one time, and had a problem with it. Maybe someone can tell me what I did wrong- I sprayed 2 coats of Martin Senour epoxy primer, waited about an hour, then sprayed two coats of featherfill. After a couple of days, I block sanded the featherfill. It sanded great, but in the areas where I sanded through the featherfill to the epoxy, it was gummy enough that I could scrape the epoxy off with my fingernails to the bare metal. I've never had this problem with the epoxy before. Should I have let the epoxy cure longer?