I painted a tractor with Imron and kept the shop at 60 degrees plus for about the first week, and now about 50. How long before I can shut heat off? Temp should level off in the 40s without heat.
Also how long until I can apply decals? I have heard of guys applying them too soon and coming back later to find them all on the floor.

I've done a couple airplanes with Imron ( RV-4) it's just like most urethanes. it should be plenty dry after a week. its a good idea to let it dry as long as you can, is it good and dry to the touch? i have had a couple bad experiences with decals, so I'm really careful with them. i have found Imron is quite sensitive to mix ratio, it needs to be exact or darn close. Google for the user guide.
Jay D.