I will assume Keelshield is not that popular on this board then. I got two response from long term Keelshield users on the Yamahajetboatforum. Both had run it on multiple boats over 10 years and never sealed it.
They said if applied as per the directions, they will not come off. I am pretty happy with the install so far. The off-white matches our hull so well, you have to look for it. It should be perfect for the number of times we beach this boat.
Good luck to anyone else who installs this product. I think it is well worth the investment to protect the fiberglass.