Chrono backstop material?
One project I'd like to try over the next year is building a small(ish) chrono rig; something where I can shoot a marker over a chrono into some sort of paint-collecting device. Obviously I can just build a wood box but what I'm wondering is:
1. Is there some sort of material I can line it with that would reduce/eliminate breaks? Some kind of dense foam, maybe?
2. If 1 isn't possible, what would be a good lining that would be easy to clean? Any thoughts on how to make it removable?