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 product (High Tech Fabric Guard 30674) works great - 100% of the water now beads up and my cloth top looks better than new !!! My Situation: The very first time my brand new, light beige cloth convertible top got wet I realized it came from the car dealer and/or factory either untreated and/or seriously under treated because water just soaked right into the cloth as evidenced by the darker cloth color when wet. End Result: After applying two coats of this product 100% of the water beaded-up and rolled right off the top. Nothing soaked in at all - zero wet spots on the cloth top. (Since the top is a light beige color any wet spots would show up slightly darker in color.) Any water that didn't roll off the top was absorbed using The Absorber 51149 sponge-cloth available on Amazon or at WalMart. Process: 1) I gently cleaned my cloth convertible top using 303 Fabric Top Cleaner (303-30550). To do this I first rinsed the top with fresh water, then sprayed the cleaner on & gently scrubbed using a very soft brush (I used Star Brite Soft Yellow Wash Brush 040013 available on Amazon). A stiffer brush or too vigorous scrubbing could damage the fabric, scuffing the threads and creating a fuzzy look to the fabric. I cleaned the top in slightly overlapping areas about 18” x 18”. 2) I rinsed the top and allowed it to dry thoroughly. 3) Using a 2" paint brush and small container of 303 High Tech Fabric Guard 30674, I applied the Fabric Guard brushing it on in a manner similar to painting. By overlapping slightly I made certain I applied the product to every square inch of the top. 4) I allowed the top to dry several hours and applied a second coat of Fabric Guard. Notes: 1) When applying the clear Fabric Guard liquid with a 2" paint brush it will start to have a slightly white/foamy appearance - this will go away completely and the product will dry clear. 2) After each application I noticed a VERY slight, very fine clear crystalline residue on my cloth top. You had to look very closely to see it - it had just a little bit of sparkle to it in the sunlight. This brushed off quickly and easily & probably would have blown off the first time I drove the car. 3) Some reviewers seem to have issues relating to getting the product on the car itself saying it was hard to remove. I didn’t have this problem. The few times that I over-brushed or got small drops Fabric Guard on the car itself I simply gently wiped it with a soft paper towel and it didn't damage anything or leave any residual coating. It seemed to wipe off 100% with a soft paper towel. 4) READ THE LABEL !!! The first paragraph covers some surfaces that you CANNOT use this product on without causing damage. These include rubber, vinyl, clear vinyl, plastics, etc. Since the product's Material Safety Data Sheet lists the contents as Petroleum Distillates, just a wild guess but prolonged contact with this product may have a solvent effect on materials such as vinyl or plastic. 5) I wouldn't purchase 303 Fabric Cleaner again – I think a bucket of hot water with a scant squirt of Dawn dish detergent would do just as good of a job. Of course, you will need to completely rinse the top and allow it dry thoroughly before applying 303 Fabric Guard. 6) I have no idea how long my cloth top will remain water repellant after applying Fabric Guard. I plan on doing this process every 6 to 8 months or sooner if I notice any water being absorbed by the cloth top.

I have used this product for several years and it continues to perform exceptionally!

We have the Ikea Ektorp sectional with White slipcovers in the sunroom at our airbnb/vrbo vacation rental. We have 2 covers so things can be swapped/cleaned as needed but since IKEA no longer makes 100% cotton slipcovers & the new ones can’t be bleached I wanted to protect our old version for as long as possible. Its sunroom location is directly off the pool area which means its heavily used and requires CONSTANT stain treatment & washing. This is life and we’re happy people enjoy are enjoying their vacation but it does get exhausting pre-treating & removing stains every 4-7 days. A lot of the issues seemed to come from wet bathing suits, suntan oils, and drink spills so I figured waterproofing might prevent wet suit color transfer & allow guests time to clean up spills before they soak in. So far this has done an AMAZING job at prolonging the time between washings!! I haven't noticed any change to the fabrics color, feel, or durability after using this religiously. A few of the cushions did develop some yellow areas that bleach hasn’t taken out but I don't know if that's a result of using this for over a year or if it was caused by a guest. —TIPS / STEPS— These are steps I’ve found work best for our use. 1. Transfer product into HEAVY DUTY spray bottle (such as those found at Home Depot) •Low-quality sprayers deteriorate after 1st use 2. Launder Items 1-2 days prior to treatment: •Treat stains w/ shout •Use as LITTLE un-scented detergent possible •2nd Wash: Just Borax & Vinegar •2 Rinse Cycles •Dryer *The manufacturers online info is very specific about the product only working if there’s NO residual product leftover in fabric. Yes...it's exhausting, but its made a HUGE difference in how well this works compared to just applying after normal wash/dry. 3. Lay down clean cotton drop-cloth in driveway & place clean items on top. 4. Put on gloves & a respirator/mask if sensitive to fumes. Also make sure no animals or children are nearby while spraying. *See bottom for further info about why this is important* 5. Spray 1st side thoroughly. •Paying special attention to the edges & piping since these areas collect dirt & color quickest. 6. Allow items to dry in sun for remaineder of the afternoon 7. After they’ve fully dried I place them in a sterile bag & put it in the garage overnight. 8. The next morning I Repeat steps 3-6 for the opposite side. •It’s entirely possible to do both sides in a single day...but I’ve found the chemical off-gassing lingers FAR LESS TIME if each side is sprayed & allowed to sun-bake for at least 5 hours before treating the opposite side. **GLOVES, MASK & NO ANIMAL / CHILDREN** Yes, there’s a very strong chemical smell that lasts 8+ hours. This is due to the ‘odorless mineral spirits’ content which is used as a carrier to help the waterproofing to penetrate into the fabric fibers. However unlike the name implies, OMS is far from odorless. So, PLEASE BE SURE to use this: •Outdoors in a well ventilated area •Away from all Animals & Children •Plenty of daylight time to allow for the mineral spirits to evaporate/off-gas. ➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖ For the sunroom we also use a Dash & Albert indoor/outdoor rug on top of the large jute rug, this has been a lifesaver and worth its weight in gold when trying to keep a rental spotless! It allows spills to be easily cleaned or even bleached out when necessary. We’ve spot treated between guests & removed to fully bleach during spring cleaning...both options are quick and easy with any stains coming right up. *Since posting the original review above I’ve also started using this on the rentals drop-cloth cabana style curtains on the outdoor pergola. Although we don’t see a lot of rainfall here in San Diego....the overnight condensation and random rainstorms meant they would only last 4-5 months before mildew & mold could no longer be bleached out and they needed replaced. After putting 4 new ones up I sprayed front/back to see if it might slow mildew. It worked well initially but after about 2 months it seemed to accelerate the issue since the new curtains were heavily spotted with mildew while the old bleached ones weren’t. This may be due to my quick spray rather than following the guidelines I use for the slipcovers. The drop cloths are heavily bleached before making the curtains so this residue + treatment might have made a bad combo. I plan to try again while following the slipcover steps to see if it works better, will update my review if so.

This product is nothing short of amazing! I purchased a used boat that has 2 canvas covers. The covers are in good condition but leaked a significant amount of water. This product saved my boat covers! I'm so happy I spent the money and went with this brand!!! I was considering a cheaper brand, but 2 things made me decide to order this one: the videos that others posted that showed them pouring water on the surface (that's exactly how it works!) and the fact that my local marina sells only this brand (for a whopping $168!) I didn't skimp - I first washed the entire canvas with the recommended 303 Multi-Surface Cleaner, rinsed well and dried overnight. I didn't actually use a garden sprayer. I used a heavy-duty industrial spray bottle (to control the application and the "overspray") and thoroughly sprayed it on in sections. It was a very hot, sunny day, so it dried very quickly. (I left the canvas attached to the boat for the application, so I was very careful to mask off the surfaces I didn't want sprayed!) I left it to dry overnight. The next morning, I did my water test by pouring a large jug of water over it. It worked just like the videos! The water beads up and rolls right off!!! I'm SO happy with this stuff, I've now used it on my cheap, not-waterproof outdoor patio cushions and toss pillows! The money I've saved just by not having to replace outdoor cushions would have justified the cost of this product, but it has also saved me a few thousand in replacing my boat covers! Highly recommended!

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!