Good deal,if it seems caked on I blow a little off so they aren't like a ghost lol just a light dust will do the trick. Sometimes when I feed 3 different feeders in a day I'll dust whatever the bulk of the food is and leave the other types un dusted.
I dunno about all that,it's possible for sure. I'm just following the instructions given to me by my chameleons breeder,there's various methods out there, this one happens to work for them so I'm inclined to believe them with a successful breeding practice. Just my .02
It's a food grade sealer used in kitchens etc so it should be fine for your cham,I had no issues. You can get it at most hardware stores in the paint/stain section. There's lots of good experienced people that may have other ideas to consider as well :)