the best solution is to remove and repair the window using the proper sealant. I would try and determine why it has moved away from the hull?
Any added sealer is only going to have to be removed to do the job correctly and if the added sealer is silicone, you will likely have to chemically remove it and it's residue to use the proper stuff and expect it to work correctly.
My Hunter used the Dow 795, I am not familiar with what the 26 used from the factory.