Until about 18 months ago, I used the 303 High Tech Fabric Guard on our 8 year old, Sunbrella bimini and liked the results except for the price and it only lasted about 6 months. Could not get 303 in Steinhatchee, FL and bought Starbrite fabric waterproofer with Teflon. Applied the Sunbrite to the bimini and it worked great. The first application was still working after 12 months and I applied a second coat as a precaution. I've been impressed with the performance and the cost is about half of the 303. Going to wait till the bimini starts leaking this time to see how long it will last.