Hi no18yes
I rolled the Eternabond out like you said using black tape to hold it in place. The Eternabond stands up in the gutter,flat against the roof,covering the seam. I started at the front cap and worked only 3 or 4 inches at a time pulling the backing off as you go. Once you get the first few inches "stuck" in place just remove the black tape behind you and keep the Eternabond standing upright in the gutter and flat against roof.About half way through I had to "retape" as the slack builds up as you work, it stretches. The Eternabond does not restrict the water flow in the gutter. Also when finished I used Dicor self leveling calking to seal the seam at the end caps, running it right over the Eternabond.
Porduct information:
I ordered 2 rolls of Eternabond Roof Seal from Best Materials
Phone #1-800-474-7570
Web Site
www.bestmaterials.com
Eternabond Roof Seal White 2"X 50' Roll
RSW-2-50 Sale Price $23.95
As for the clean roof, I bought the rig new in 2000 and keep it under shelter and use lots of Mothers Wax Thanks Jim Bob