Is there anything to put on a sunbrella sail cover that will make it waterproof again? Looking for something that will last for at least 1 season each time..
+1 on the 303 but make sure you clean the Sunbrella first. A little Woolite and a hand washing is recommended.303 Fabric Guard is endorsed and recommended by the manufacturers of Sunbrella as the best solution for restoring water repellency to Sunbrella fabric.