Sealing Couplers? TIP

At a recent launch, the red coupler on my Patriot got wet.
The coupler swelled up a bit. The upper section was left out until it dried. I was concerned about the damp coupler swelling up the inside of the body tube.

In the picture you can see the darkened low end, sealed with medium CA glue.
In the middle left (above the dark CA glued area) you can see where water has been absorbed into the coupler.
I may have to seal the entire exposed end of the coupler.