A roll of clear packing tape can come in handy at the field. More than once I've ripped or punched a hole in my covering. Just clean the area with some glass cleaner, patch it up with clear packing tape, and you're back in the air again! I've meant for that to be a temporary fix, but in many cases the patch worked so well that I just left it like that. The clear packing tape will even heat shrink if you need to tighten/smooth things out later.