Dicor isn't bad stuff....but it doesn't last! In a couple of years, it begins to dry and crack. I have been using Dicor for years....until......I found this: Roof Sealing | Sika Corporation U.S.
I have been using this SikaFlex 715 product for about a year now, and it has NOT exhibited any of the problems found with Dicor. I haveused it with great success on metal, EPDM, TPO and fiberglass RV roofing substrates.
I would highly recommend it over Dicor!