Not sure that is a good idea due to the smell spray paint gives off even after it is dry. I would just get a cheap after season vest for a buck or two and either pin it or sew it on to the back pack. No need to give the critters and more of an atvantage then they already have.
I don't wear it to hunt. Just haul meat out after the kill.
I usually just wear a waist pack to hunt in. I carry some food, and everything I need to dress out the elk. I then carry back the backstraps and loins to the Jeep. Lock up the gun, and grab the big backpack and go get the meat. At that point i'm not hunting anymore, but I think the blaze orange laws still apply.
Everyone has different ideas about trophy pictures. Looks around and you will see "long armers," "set behinders," "big cheesers," and "blood covered brutes." I have a few tips to keep your trophy pictures from being laughers or worse yet just plain gross.
#1 Clean it up. Try to avoid bullet holes, gut pile, mass amounts of blood, and the tongue sticking out. You don't want your big buck to look like a angry 1st grader with his tongue out or a MMA fighter during the 3 round.
#2 Long arming...