dicor self leveling lap sealant on slide out roof?

Mortimer Brewster wrote:
I would remove the old tape and put down some new Eternabond. Be sure to clean the surface before applying the new tape.

That's what i would try to do. When you install the new tape, then i would put some Dicor around all the edges. If you do it that way and do a good job in the cleaning/prepping, i think you will be good for a long time.
Good advice as suggested, give the Dicor some breathing time to cure .