This is the product that I put on my 97 Bounder.
http://www.epdmcoatings.com/videos_play.php?vid=25 I did not use primer, but it was not over the factory EPDM either, so I guess I did not need the primer, you will. . .
The product was thick enough that it did not run down the sidewalls. I did not use any blue tape either. I did use a coffee mug to dip out about 1-2 cups of material, then spread it out with a 3" paint brush. I guess I could have poured it on, but then I would have drips down the side of the 5 gallon can, and did not want that.
I used about 8 gallons on my 30' Bounder. I put it on really thick, so I will not need to do it again for years.. .
You might find it easy to apply from a 8' ladder, or even a 10 foot step ladder along the edge. I put it on while under the covered storage roof, think pole barn with 14 - 20' tall towards the center.
You will need to clean the old roof - or what is left of it, well, and then apply the primer and material. You will have about 5-6 hours of pot life before the stuff starts to harden, so you have plenty of time at 70F. Warmer and it will cure sooner. It stops curing below 55, until it warms up. I used a lot of towels and washcloths. It might help to have some disposable coveralls, or something you do not mind getting a lot of the material on your clothes. Good gloves too.
I used to camp in a off road place with a guy named 'Whit' in Jawbone Canyon. . .
Good luck with your project!
Fred.