We've had the same ongoing problem with our 2021. Prior to the 2016 Thor take-over of Jayco, Jayco used really nice double-bulb seals on the slideouts. I really appreciated that about Jayco. Our 2016 Jay Feather had them, and they were solid. 2016 was the last of the Jayco models built prior to the company becoming a Thor subsidiary. Since then, there are a number of areas where materials in the units are of a diminished quality. When we bought our 2021, we immediately noticed the diminished quality of the seals and other parts throughout the coach.
As for your problem, I am on my third set of the cruddy, extra thin rubber single seals around the slideout. They are tricky to screw in. It depends on where Jayco put the original holes for the mounting screws. Ours are way off; you have to poke a hole in the rubber to penetrate and contact the hole. On my last replacement, I considered drilling new holes; I may yet do that.
Instead, I went for an RTV sealant application with no screws:
- I inserted the seals in the track.
- I sealed the cheap plastic track on both sides from top to bottom with black RTV.
- I also ran a thick bead at the top and bottom ends of the seal (being careful not to clog/block the open ends).
I did not use glue because I know the seal's material grade is such that it will fail again. Glue would be a huge ordeal to clean up. As sealants go, RTV is not the worst for removal and cleanup. So far, I am pleased. After a year of use, they are staying in place.
After the seal's first failure, I ordered extra seal, and I keep the part number in my Jayco file. I am sure I will need them again. They are going to fail. Jayco cut back on the grade of the rubber, and they are single bulb. They tear with the slightest stress or misalignment. If Jayco is interested, I have a list of things they used to do well that they should reinstate in their builds. The seals throughout the product are one of several important build areas where they should go back to their "old" ways.
