I have been making some parts with hand lay, with EL2 epoxy slow. Now after curring sometimes the parts stay a bit sticky on the surface. I am guessing it has to do something with the temperature while curing the part. I am currently trying to get the room up to temperature while curring, but what can I do about those parts that stay sticky? I don’t prefer to make them again...

Thanks, it has like a skin on top in places, this skin is tacky places, the majority of the surface is fine and it appears to be solid underneath this skin. I have a small atomiser spray unit, it has been unused. This may sound silly, but if were to spray the surface with hardener would that be a possible solution? I am almost at the two day period since mixing and pouring.