I used Sikaflex 21 this fall to reseal my roof, it's more expensive than Dicor but it is a very good product as mentioned above. I also used the Dicor self leveling on the flat seams around the vents. The Sikaflex i used on the sides of the molding along the roof and all the ladder and hand rail supports where you don't want a flow out. We have had a large amount of heavy rain since and haven't found any failed seams yet. The PO had used silicone and it just turned to snot. I had to remove all of that and then used acetone to remove the residue before re sealing. I'm very happy with the outcome.