I'm a long time Durabond user with a unique problem. A deep (1 inch) fill over a drywall repair will not dry. Twenty-four hours later, after using a fan, I'm removing it and will do a test batch before proceeding.
Has anyone ever experienced a case of Durabond 90 not drying??? The bag is unopened, but is 9 months old. It seems to me that it should harden even faster if it is old.