I put this on my roof. It was about 9 gallons for a 30' Bounder. I put it on thick, as I did not want to have to wash the RV again, and put on another layer in 7 years, but rather 8-10 years!
http://www.epdmcoatings.com/rv-roof-repair.phpWatch the video. It is pretty easy to do it yourself, but in the hot sun! I would recommend hiring someone from the local Home Depot parking lot, if you can find a good laborer there. They can wash the RV for you, and if you like the work, see if they know how to paint. IT is basically as easy as painting a room. I would stay there to supervise constantly, and offer help, and work with the helper. You do not want the stuff running off the sides, and down the walls. I used a 4" wide paint brush and a coffee cup to dip out a couple of cups of material at a time. Put it on the roof, then spread out with a brush.
Given that it will be around 85F+ when you apply this stuff, it will be thinner and dry fairly quickly. I was working around 60F - 65F, and had a very long "Pot" life, before the stuff turns solid in the can. Basically you mix in the hardener, and wait about 1 hour before applying. Then you normally will have a 3-6 hour pot life, before it starts to harden in the can. Keeping it mixed will extend that life.
I had about a gallon left over, and by keeping it below 55F, it will not cure at all, so I Put it in my freezer in November 2014, taking it out to coat another RV in May 2015. That repair also went well, I just patched some leaking seams.
They offer to sell a drill mixer for about $15 - $20. My wife say the 'dirty' mixer and tossed it in the trash between the time I bought the first 5 gallons and the second 5 gallons. So I bought another mixer at my local paint store or maybe Home Depot. It was better quality and only about $9. It is thick stuff, my 18 volt drill mixed it well. You can not mix in the hardener by hand, it will not stir it up that well without the electric mixer.
I used some chemical resistant gloves (thicker than the disposable ones that would tend to tear). I bought a tyvec suit, but did not use it after I overheated!
The stuff is pretty thick, and will not run down the sidewall if you pay attention to brushing it on the roof, then slowly painting some on the sidewall where the curved roof meets the awning rail. You do want a thick coating at the seam, but not so thick that it runs into the awning rail. I went back and put on a second coat with a 8' tall ladder, from the ground after finishing the RV roof.
One RV owner said he bought a gallon container, and a 5 gallon bucket. Washed the whole roof and applied the first gallon to all the seams, around the base gasket for the A/C and all the vents. Then waited until the next day to coat the entire roof. He thought he was running low on product, so put it on thinner, but as he got towards the ladder realized he had to much left, and put it on thicker.
I started out putting it on pretty thick, and as I got to the front A/C realized I Was down to the last 3" in the 5 gallon bucket. Knowing I would not want to put it on really thin, I did the shower skylight, and stopped when I ran out of product. Ordered a second 5 gallon pail, and finished a couple of weeks later.
Best part is no more white streaks! The original roof was designed to flake off, so it would look 'new' over time. But this caused white streaks of the roofing material on the sidewalls of the RV, when it was a long time between rain storms.
Good luck!
Fred.
