You don't state if you have a replacement window or your location. Is the seal allowing condensation into window ? Do you intend to remove , reseal , & reinstall ? I think even a removal & reinstall can be challenging for a DIY. I am enroute to have a window resealed.
The Co. is Suncoast Designers Inc., Hudson, FL: http://suncoastdesigners.ccwindow.com/.
They have a NC camp area w/ elect., water, & dump. $200.00 to remove window, repair seal, and reinstall. There may be someone in your area similar. Suncoast has been highly recommended by previous customers.
Plus they warranty their work.
Good luck,
Dave