303 Marine Fabric Guard (1 Gallon)

We apply this every year to the canvas cockpit enclosure of our boat. By sealing the fabric, we keep the cockpit dry, but also slow down the development of mold and stains on the canvas.

I’ve tried several brands of products for waterproofing. This one isn’t cheap but it works, though it smells very much like it contains the same stuff as Fabsil.

This works really great one bottle was pretty for my little boat cover and even brought some color back to cover. Was streak free and no greasiness to it at all.

I have a Classics Accessories boat cover that I bought from Amazon back in 2010 that is still in excellent condition. Unfortunately, its ability to repel water is no longer all it could be. Doing a little research, I came upon this product courtesy of the Sumbrella folks and thought I'd give it a try. There are basically two steps and you need at least one day when it isn't going to rain to get the full benefit. First, you clean your cover with 303 Products Fabric and Vinyl Cleaner. I bought the 32 oz size and hardly used any of it. A little goes a long way. I just wet down the cover on the boat with water, sprayed some cleaner on it, then scrubbed it with a soft boat brush on a pole. Hose it down well when you're done and walk away. Come back tomorrow. If it rains, no big deal. It's the application of the water repellent that requires 12 hours of sunshine; not the cleaner. The next day, I sprayed down the boat cover with the 303 Products High Tech Fabric Guard with Water Repellent. I used one of those $15 pump up sprayers that you use to spray Round Up in your yard and it took the whole gallon to treat my boat cover (which is on a 17' power boat). I walked away again. 12 hours later it was completely cured. This morning I stepped outside with a glass of water and threw it on the cover. The water blew off the cover like a hurricane was chasing it. Unbelievable! Talk about hydrophobic! I could not be more pleased. This isn't cheap but I can't see how anything else on the market could work better. It is incredibly effective. According to Sunbrella, I should be good for another three years, assuming the cover doesn't just wear out first. It sits in the sun out in the driveway every day the boat isn't actually on the water.

We just bought a used 2001 Newmar Dutchstar motorhome and the fabric awning leaked like a sieve! Whenever it rained everything under the awning, including us, got wet. I researched numerous products and through an RV forum found a recommendation for 303 Fabric Guard. We also bought the 303 cleaner. Cleaned the awning one day and let it dry overnight. The next day we sprayed this on the awning. (we bought the 128 Fl oz bottle and used a pump sprayer like you use for weed killer and put it on the lowest setting so it came out like a heavy mist). We covered the areas of the motorhome that were close to the awning to prevent overspray from getting on the paint and windows and then sprayed the awning. It probably took longer to cover the areas of the MH that we didn't want to get sprayed then it did to spray the awning. Spraying the awning probably took about 30 minutes. This is the only product I have ever used that tells you to do it in direct sunlight! Lucky for us it's been hot and sunny! We had to wait over a week to see if it worked though because it hasn't rained for several weeks. Last night it rained so we stood under the awning and not a drop of rain came through!! Yay!!! 303 Fabric Guard works great! We will have to wait and see how long it will last. I am hoping to get a few years out of it before we need to do it again. This is an honest review from a motorhome owner and I am not being paid to give this review. I would definitely recommend this product. The price is very good especially comparing it to buying several cans of Scotchguard or something similar and the product works as well as they claim it does!

Our boat cover had gotten to the point where rain just sat in puddles across the top instead of running off, worried it was slowly soaking through and encouraging mildew underneath during storage. Grabbed the gallon size specifically to treat the whole cover since it's a big piece of fabric and I didn't want to run out halfway through. Sprayed it on while the cover was laid out flat and fully dry, made sure to get even coverage across the whole surface including the seams where water tends to sit longest. Let it cure overnight before covering the boat back up like the instructions suggested. First real rain after treating it made the difference obvious, water beads right up and rolls off the sides instead of pooling on top waiting to soak in. No more coming out to check on standing water after a storm, which was my main worry with our old faded treatment. Cover still feels normal, not stiff or crunchy like I was a little worried a fabric treatment might leave it, folds and stores the same as before. Only complaint is you really do need calm, dry weather to apply it properly, had to wait a few days for the right window rather then just doing it whenever I had free time. Great fix for a cover that was starting to soak through instead of shedding water like it should. Applys easy but there is definitly some odor so do it in the wind if you can. Not sure its safe to huff in.

Very happy with how this is performing. It has been about 6 weeks since I applied it to my Sunbrella fabric on my outdoor couch. These pads would get dirty within 24 hours of laundering them and you simply could not clean them without taking them off of the foam, spotting them, and laundering them. A major pain. Now after 6 weeks they are still perfectly clean. Anything I get on them brushes off. My advice however is to not do what I did. I sprayed everything down and had about 1/4 gallon left and decided to put a second coat on rather than toss it or store it till next year. Don't do that. It left an irregular pattern on them, it is barely visible, but prior to that they were literally perfect. I used a pump sprayer that you would typically use to spray weeds and that did a nice job. Also, avoid overspray on your patio, now the water beads up there and not other places, so it is a bit weird when wet. I have not been covering the furniture at all and all the random outdoor stuff that blows around or animals bring in has not been a problem, nor has my 13 year old son's penchant for spilling food on them. I expect to launder them next spring and put a new coat on, but maybe I won't need to.