I've used both 303 brand and Star-Brite brand. I did not notice a difference in performance between the two products, and Star-Brite was much cheaper. Not a scientific result ... just my own observation. Star-Brite is something like $45/gallon (303 is closer to $80-100/gallon). I pour the Star-Brite into a 2-gallon garden sprayer for application. It's much easier and quicker application than those little hand pump bottles. It's easiest to do this with the canvas laid out on your lawn.
The 303 spray bottle is terrible !
It is a shame that they have not changed the design or the material. Your hand and arm are literally soaking wet after :30 seconds of spraying
Ask of the Sunbrella company. They've been there. I went around and around with Sunsetter abut my $4000 awning which leaked to the point it was useless in the rain. Sunbrella had the answer. Sunsetter spends more on advertising than on customer support in my opinion.
sunbrella makes a water proof version of most of their fabrics. it has a vinyl layer on one side and is really made for Bimini tops. it will not leak except at the stitched joints where they stretch over time. I use a tent seam sealer for the seams. its applied to the underside and works very well.
West Marine sells a water proofer endorsed by Sunbrella. It is for acrylic fabrics that don't have a vinyl coating. I have used it on non-Sunbrella, relatively loosely woven acrylic with excellent results.
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