Front window seal
That old timer is full of @#$%. Butyl was used on the lower pinch welds.
Actually speaking of old timer your Butyl Rubber was invented in 1931 and it is cheap... I did't realize we were working on a house gutter system, flashing or sidewalk joint. This stuff never really cures.
I prefer a catalyst base compound- RTV silicone rubber
RTV Silicone Rubber will reproduce fine details and is suitable for a variety of industrial and art related applications including prototypes, furniture, sculpture and architectural elements. RTV Silicone Rubber can be used to cast materials including wax, gypsum, low melt alloys/metals and urethane, epoxy or polyester resins (without using a release agent).
RTV Silicones industrial applications include aviation, aerospace, consumer electronics and microelectronics. Some aviation and aerospace product applications are cockpit instruments, engine electronics potting, and engine gasketing. RTV silicones are used for their ability to withstand stress and temperature extremes.
Both make an excellent seal, it depends what you want old-skhool or
new-school...
