Answer to: no longer waterproof, what do I do?First, spot clean the bag to the best of your ability. When you add any water-proofing, it will seal in those stains and spots. There are forms of re-water proofing chemicals. If you wish, you can use Tech Wash and follow up with their ReviveX product. That's a pretty thorough method. Otherwise, spot clean and apply Scotchguard --it will keep dirt and misty rain off your bag.