303 Products Fabric Guard – Waterproof & Stain Resistant Fabric Spray for Outdoor Furniture, Upholstery, Awnings & More | Safe, Non-Toxic Protectant | Easy to Use | 16oz (6 Pack) | Ideal for Patio Sets, Boat Seats, Camping Gear & Outdoor Cushions

Ok, so I made two purchases here on Amazon for this stuff. I started with some small spray bottles (this order) and then progressed into a large 64 oz. bottle instead. I am going to just paste this review into the one for the larger bottle as well as it's the same.First the need. I renovated a pop up camper I got cheap. It was horrible with mold and mildew. I cleaned it for hours, scrubbing the inside canvas. After enough elbow grease, I got it all spic and span. At the first rain, it leaked like a sieve. I then realized that me cleaning it removed all of the water repellency on the inside fabric. I researched and found this 303 protectant. I initially purchased these smaller bottles but with the area I had to do, I should have purchased 1 or 2 of the larger bottles first.I applied this liberally to the inside fabric on the camper. **ENSURE YOU FOLLOW THE INSTRUCTIONS** Let it dry completely. I ensured it had at least 2 days to dry in the sun. No rain. On one day it was cool so I even placed a small radiator style oil heater in the camper to help it all dry. I then rechecked it after leaving the camper open in a heavy rain (or you could use a hose and a sprinkler). There were a few spots that I re-treated.VIOLA..it was water proof again! We also treated the newly redone cushions for the dinette too. Works great.Now, a word of advice. If you have a large area (anything that you would need more than one single spray bottle to cover) INVEST IN AN ELECTRIC SPRAYER. Lowes sells the hand sprayers that are battery operated (they may also here). They are designed for pesticides but work perfectly with this application. My hands were sore after the first day by spraying the manual sprayer. I used the electric sprayer for the remaining areas and it went quick and smooth. It covered the areas better than the manual sprayer ever could.I would certainly recommend this product. The large bottles should include the $5 sprayer.