I'd just keep checking.
Mine was redone and they used the Eternibond tape BUT then poured the Dicor over the tape.
While checking don't forget to check the seals around any running light fixtures. I had a winny that leaked around those lights up on the front cap.
Ok before you say do it, here are some variables that may or may not sway you:
Coach brand new in May 2007, Owned it since June 2007.
Stored under cover/inside when not in use.
We live in non hot sun country
Never been winterized as the storage is insulated.
No leaks or appearance of seal damage.
But it's been 5 years.
Should I just do it or keep doing what i've been doing which is inspect 2x per year (spring and fall).
I"m leaning to inspecting but I'm fearful I'm just being lazy
I had my first leak (very minor, very slow drip) this year. I used Dicor to fix the problem on the first sunny day. I own a Winnebago (bought it new Jan. 2004) and my coach is outdoors 24/7/365. After doing all the seams, if I still own the coach I'll do them again 2020!