If it's just needing to be re-caulked, FR recommends a caulk manufactured by Silaprene. Most dealers stock it or it can be ordered through FR's parts department.
If the front cap is beginning to seperate, I would use about anything for now as a temp fix just to keep any water damage form happening, then I would take it to a repair shop to have them check it out. There would be a reason why the front cap is beginning to seperate and I would think it will only get worse with time.
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