As long as you mixed it properly and let it cure, it will be hard a s a rock eventually.

You live in the desert. How often do you think you're going to use the wipers? Unless you move to Seattle and drive your truck every day, it will never wear out in your lifetime.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)