I used to work for Nusash in Illinois when I first started in the business in 1975 and was with them until 1985.
NuSash is no longer affiliated with LP. They were first bought by American Architectural Products, and then bought again in 2002 by Monarch Holdings, which also owns Hurd Windows & Doors.
I would contact them directly and see what they'll do for you.
American Weather Seal Headquarters
100 Smithville Road
Orrville, OH 44667-1066
Telephone - 800.358.2954