After only three years, the Herculiner that I applied to the roof is coming off and leaking around the seams where it did shrink, along with the EPDM that is under the Herculiner. I did not want to apply more herculiner, and decided to apply the stuff in the second link, EPDM two part coating.
http://www.epdmcoatings.com/rv_roof_repair.html is the link to get some.
I bought 5 gallons and it says will cover 20 mils thick at 42 square feet per gallon. Knowing how well the Herculiner stuck to the roof when cleaned well and applied thick, and not wanting to EVER coat the roof again! I put down a thick coat, and ran out of the 5 gallons before getting 1/2 of it done. Being tired (and lazy) I quickly gave up and decided to only coat the passenger side and will go back next weekend and recoat the areas that I missed.
Re-reading the original post, I did clean the area around the skylight really well, and then coated it with a "Trial" gallon of Herculiner. However the rest of the roof I was lazy and did not clean it well, and did not apply the herculiner nearly thick enough. In the thin areas, it came off with a washcloth, and was not sticking to the old EPDM roof that well. In the thick areas, I was able to pull off thin areas, but it ripped at the thick area, and I was not able to get that off at all!
Still the area near my skylight the material had shrunk, and needed to be recoated, because it had started to leak rain water.
I did scrub the roof well this time, and it came clean. I will need to order another 5 gallons of material, and apply that to the drivers side behind the antenna, and to the middle section of the roof. The first 5 gallons coated the front 6' really well, and I kept going all the way down the passenger side - coating the roof seam to the awning line, and it should be thick enough to last a long time.
I still need to remove the Maxx Air covers and A/C cover, then wash under those areas, and coat the rest of the roof. Raise the antenna, and get from there back to the ladder area. I guess I will also need to bring along a 6' ladder to be able to coat the roof near the RV ladder (without me standing on it). I don't have access to my old work ladders, that would be really handy to have a taller one.
Fred.
This is a place that I found has great prices on Eternabond.
Eternabond with 4"X50' at around $50.
