USED IT TO SEAL THE SEEMS ON MY NEW:
NTK Laredo GT 8 to 9 Person 10 by 15 Foot Sport Camping Tent 100% Waterproof 2500mm
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This stuff really did the trick on our 2003 Saab convertible. In even light rainstorms there'd be water penetration, and during heavy rains..... oh, la la, you'd get an entire shower inside the car! We did two applications of 303, about a month apart and that seemed to do it. No more leakage.

Apply it generously and make sure the fabric is really soaked in the stuff. It's been about seven months now since we bought this product, and realize that two applications aren't going to be a permanent fix, that we'll have to reapply periodically. At $53 per bottle this isn't cheap, but it beats a new $3500 convertible roof, especially when the fabric on our current roof is still holding up nicely.

This stuff worked really well. Our popup trailer canvas has lost all its waterproofing (Sunbrella fabric). The directions called for us to paint this on and soak the fabric. It took most of the day, but well worth it. Water sprayed on that evening beaded off like a ducks back! I used a mid range paint brush, careful not to get it on the vinyl (very damaging, carried a rag and wiped drips off quickly). The canvas behind screens was the hardest part, but now that all the work is done and the entire camper is waterproof we're guaranteed not to get rained on!

This product is amazing! We bought it hoping to squeeze another summer out of our 10'x12' awning canvas (the poor thing is at least 16 years old and had started letting the rain seep through) - and the product worked fantastically well to restore awning's waterproofing. A few application tips: use a spray bottle to minimize color loss from your fabric and immediately clean the spray bottle (or be ready to throw it out after use) because the liquid dries hard and gunks up the sprayer. Totally worth the purchase price! This worked much better than the boat canvas waterproofing that I purchased last year from the marine store.

this thing is pricey but amazing, well worth the price compared to 'similar' product, totally waterproofing solution for fabrics at least, umbrellas, canopies, etc....If you have a small wood deck (bc the product is expensive), works marvels as well, drastically better than any other deck waterproofing products you can find and by a long long shot. U cannot go wrong with this product if u use it well. Fabrics: get it wet but not soaking wet. One application lasts a year, no problem. We live in CT and it rains quite often and usually a lot at times....