Don, you're not shooting at black Celotex are you? The black coating on that stuff is nasty and will bond to any arrow you shoot into it, no matter what it's made of or what kind of finish it has. If you're using Celotex, you need the more expensive and harder to find uncoated type.

Our club just took all our Celotex butts off the practice range. We couldn't find the correct stuff to rebuild them, so we replaced them with Morrell outdoor range bags.