Hi,
The two part stuff that I applied over the past few days looks like it will hold up well. I am having some hard times getting it to cure. It is under a cover (like being in a barn) and it is cold at night (46 - 55 overnights) with 70's in the day. So what I applied 7 days ago was not dry on Sunday, and where applied thick, I was able to move with my foot accidentally. It came off in a sheet about the side of a half dollar. I was able to re-coat with the second 5 gallon of stuff I was applying yesterday. It is a thick and flexible coating.
The Herculiner is still holding strong in areas where it was applied thick, and where I had spent time to clean the roof well. However much of the roof was kinda old when I started applying the coating in April 2011 (it was built in 1996, I took delivery November 8). So I would have been much better off applying the coating when the RV was only 10 or 12 years old in 2006 or at the latest 2008.
Some areas, like near my refrigerator vent, the Herculiner was really thick, say 1/8" and the thin area pealed up, but where it was thick was kinda like trying to rip apart a tennis ball. (yes had a pit bull a while back, so I have ripped apart tennis balls that she started to pull apart). . .
Herculiner is very flexible once it drys. (at 3 years old it is as dry as it will ever get). The cup I used to dip the material out of the 1 gallon containers I was able to let dry for a few weeks, then peeled the Herculiner off the coffee cup, and it was in one piece, still have it someplace in the RV.
Right now I have 1 gallon left of the second 5 gallon can (30' RV so 6 gallons would have applied at the recommended 20 mils thick, But I wanted it on thick this time). I have it in the freezer (no room in the refrigerator) to keep it from going solid on me, and extend the pot time. I hope to take it out of the freezer on Friday, allow it to warm to 55F (where the pot time starts ticking again) and apply some more to potential trouble areas of the roof on Saturday. Maybe even take it out in the sun, or if it starts to rain, leave it outside and check for possible leaks?
As I stated before, I am not liking any one part roof coating. My old camper was in Washington and it sat with a rain puddle on it, until it leaked. That destroyed it. It was a 72 Coachman, with a aluminum roof and seams every 4' or so along the roof from drivers to passenger side. I bought the coating at a local hardware store in 1994, and sold it to my sister in 95.
Good luck with your roofing projects!
Fred.
