What size Eternabond????

Go 4 inch wide. You can always cut it down into narrower pieces if needed.

I just bought a 6" wide roll. I figured it's not going to hurt up on the roof top. Wider protection. Looking at some of the Dicor factory sealing work I thought It would be easier to get a good seal over the Dicor.

Get the 4", and yes, EB tape can be applied over Dicor, no problem. You don't have to buy their cleaner, you can use Acetone per their instructions. Make sure it's installed per their instructions, to the letter, and you won't have any problems. You can download the instructions ahead of time so you're ready. Make sure you have a good roller too as you have to push very hard to get the adhesive to squeeze out.

X2 on really surface clean before installing. I used 4" for the edges and 2" around the vents.

I use the 4" Eternabond. It gives better coverage.
You can apply it into the gutter, just make sure the surface is clean.
I have used Acetone and mineral spirits to clean the area before applying the E/bond.
Be careful if you use Mineral Spirits.

I have never used the spray, just clean the area well before applying.
And, I just remove the loose Dicor. I will apply more Dicor to level the surface if needed, before installing the Eternabond.

Eternabond is a great product. It's not difficult to install but, take you time and clean the area well.
It will eliminate any leaks for a long time.