Rain gutters and body seam sealers

CFD244 said

I am using 2 part OEM bead over the seams that I epoxy prime first. Tape on both sides of the seam for a nice smooth application. Seems to work really well, but it's expensive and you need a high ratio caulking gun to apply it.

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Do you know the name of the 2 part bead? I have read that the 2 part is better for external applications but not sure which one to get. Don't mind paying a little more if it's going to last. Don't want to be doing all this work only to have it shrink and crack in a couple years.

It will be getting applied over epoxy primer. Inside I plan to use the regular brush on seam sealer, but want the better quality stuff for the outside where it can be seen.