Hi, Scott,

(nice pics...thanks) (nice coping, too...I like that look)

Pretty sure that's acrylic caulk (acrylic shrinks). Too bad they used such nice coping material and short changed on the caulk.

Anyway, I believe your course of action is to remove the old caulk and replace it with a high quality polyurethane caulk. Removing the old is probably going to be 75% of the work. I'd start on a small section and get your system perfected start to finish.

Once you get the section cleaned out...doesn't have to be perfect...be sure to use masking tape on both top and bottom of the new caulk line. I have had very good success with a caulk named Vulkem 911. Comes in many colors and not too much money...about 3.25/tube, I think.

Again, the poly is tough to work with (not water soluable) and takes days to dry out but you'll never have to replace it again.

Dave S.