I decided to hunt for a date on the bottle of Model Master Window Maker glue that I have been using for 20 years and was surprised to find it to be from 2000! It seemingly works just fine to date. Once I realized how old that bottle was I grabbed the Model Master liquid cement (in the similarly shaped black plastic triangular bottle) and located the date..........1994! This glue looks and works the same as the day I started using it when I was 15 years old! Needless to say, I have not bought many model building supplies in a long time. I also have not been afforded the time to build, let alone finish, a model in 15 years now.