I just got the badger a week ago and was painting some blades but did a little with spoons. I haven’t had any problem with overspray to the back. I heat them from the bottom for at least 40 seconds and then hold them sideways by a pair of pliers in my State of the art paint booth (a sideways amazon box). I do all my blades with my first color and then switch jars reheat and add the second. I think the key is holding the spoon straight, having the tip of the gun screwed all the way in, and I spray relatively close to the spoon. Only a few inches away to be accurate.