Brownels told me to give the acraglass a week to get to 90-95 % to dry and keep it in warm place. After that it will take a month to a month and a half for total hardness. The tech told me if his is over 10 years old it gets thrown out. Mine has to be around 15-18 years old. I was told it will still work but takes longer to cure being the chemical properties have broken down over the years.
I'll check it towards the end of the week and see if it's getting harder.