The September 5, 2007 ARRL Contester’s Rate Sheet has the following tip:
To remove stuck-on Coax-Seal from connectors and cables, Carl KM1H recommends Brake Clean if you’re working on the tower. On the ground, use Lacquer Thinner or Acetone which are harder to use aloft. Steve K7LXC also notes that professional grade vapor wraps leave much less residue than Coax-Seal.
Coax Seal is a terrible product… period.
It oozes an oily mess in warm weather into your connector and outside the wrap. It is a b*tch to clean off.
A far better solution is to use Scotch 23 self vulcanizing rubber tape. Apply with ~40% stretch and within a few minutes it bonds to itself. To remove, cut through it with a razor knife and it will be clean as the day it was sealed.
I worked on a radar site on Kwajalein for 20 years. Salt and rain. Scotch 23 with a covering on Scotch 33 Plain Jane electrical tape was the key to protecting connectors.