WINDOWS ON 1999 MONTANA 5TH WHEEL

[dwad]

I JUST PURCHASED THEIS TRAILER FROM A 75 YEAR OLD COUPLE WHO HAD NOT USED IT FOR 4-YEARS, THEY FINALLY WERE ABLE TO SAY GOODBY TO THE TRAILER. THIS IS MY FIRST TRAILER IT HAD BEEN SITTING OUTSIDE ALL THIS TIME WITHOUT PROTECTION FROM THE ELEMENTS. WHEN I WASHED OFF THE ACCUMULATED DIRT THE "CAULK / GASKETS" UNDER THE EDGES OF THE WINDOWS WAS CRACKING AND FALLING OUT. HOW DO I REPAIR THE WINDOW SEALS BEFORE DAMAGE IS DONE INSIDE?