I know it's been almost a year but give an update. Finally bought the Zep and did the old girl. WHOA... looks like new... I elected to do 5 coats and it only took about 1/2 gal to do all 4 sides on a 29ft Class C. I also elected to keep the pin strips.. cost over $1000 to replace.. not worth it... the Zepp brought them back to life. One thing that save me a lot of extra blood, sweat and tires... I used Bar Keepers last fall to give a really good cleaning.. so this cleaning was a bit easier to do.