Interesting that you used Flex Seal for the tail-light voids.
I used Epoxy on mine; partly because it is old-school, and partly because I had some delamination in the plywood, and the Epoxy took care of that. But I see no reason Flex-Seal would not work, especially if the plywood is not yet damaged.
If manufacturers are going to insist on using those tail-lights, they should be protecting the void behind them... but then they would have to buy and apply some form of sealant.
And then it would cost more, so they could have "upgraded" the tail-lights to a version that did not leak in the first place.
Sometimes, being cheap costs more.
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The only thing that works on a RV is the owner...
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