Flex Seal 14-fl oz Gray Aerosol Spray Waterproof Rubberized Coating in the Rubberized Coatings department at Lowes.com
Amazon.com: Obenauf's Water Shield Odorless Durable Waterproof Spray for Fabrics and Leather - Water Repellent Works on Canvas, Suede, Leather and More - Great for Camping and Other Outdoor Use (16oz Bottle) :
Silicone Water Guard Fabric Waterproofing Spray Canvas Boot Shoe Water Repellent 31600704128 | eBay
ReviveX Instant Water Repellent Aerosol Spray - 0021563204209