I've read where people are using bondo to fill hollow stocks. I'm wondering if it would be better to use glass bedding instead. I recently picked up a Mossberg ATR and I am planning on filling both the butt and forearm to add weight. Yes I want it heavy for recoil control for my son. After I fill the major voids I plan on bedding the action. So then the question would be would one stick to the other. Has anyone tried either of these and how was your outcome?