
It is very difficult to re-pot the module thouroughly.It requires a vacuum chamber for degassing a silicone or polyurethane poymer after sealing the watch permanently and leaving a hole in it for entry of gel under vacuum.In other words it is a big project with no guranteed results.The other thing is these different gel options out there do not come in a tube and most manufacturers want 1 Gal or 55 Gal minimum order.You have to mix it yourself,degass,pour and....___....all in 20 minnutes before it starts to cure

Now if you just want to fill the bottom area and leave the solar cell area without gel or with the old gel intact there may be a dielectric electronics type silicone in a tube you can pour on the bottom around the voids but bubbles will happen.These bubbles might not be as much an eyesore as compared to a bubble stuck between the solar cell and the Lexan top.
A good RTV clear silicone could do a good job of temporarily sealing things but you may have to inpect the seal for repair every few months.
If you don't plan on getting it wet much and everything works, your already jellin fine. Seal it up

Not sure how i was branded wizard here but i still have professional hands on experience.