szon3 I often have young people visit me and handle my animals. I have a very large female and a couple of large males. I have a few ground rules for the safety of both animal and visitors
Never handle an animal alone. They are free to look but to take out and hold needs an adult around and to be told that they want to take out one of the snakes. The other is if they are going to place the snake on their shoulders, they must sit down. The snakes do not tighten often but if they do it is because they feel unsteady sitting down prevents that mostly. Two simple rules.
As to the sealer I have no direct experience with that particular product typically with paints in general that once they have 'gassed out' they are inert and non toxic. UNLESS there is some anti fungal or bacterial component of some sort. Usually I'll allow 10 days under well ventilated and warm environment to make sure that is complete.
Alex