dicor self leveling lap sealant on slide out roof?

I went to a maintenance seminar put on by the manufacturer of my unit and they did not have a very high opinion of Eternabond and would not suggest it be used anywhere. They suggested it could be used as an emergency patch but that the edges often failed to seal and should have a bead of Dicor applied to seal them.

I have never used it myself, just relaying what the pros said.