Moisheh,
As Ben says, they used silicone. However, silicone is difficult to repair because new silicone won't stick to old silicone very well. Neither will other sealants such as Proflex.
Like Boomer, I also have had better results with Proflex, but you have to completely clean off all the old silicone before applying it or virtually any other sealant. I have used plastic scrapers, non-abrasive scouring pads and tried silicone remover as well as other solvents. One that seems to work well is Acryrsol, which is available at auto paint stores.
Good luck!
Roy
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Roy and Debbie
07 Diplomat 38 PDQ
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