It is unadvisable to freeze opened bottles. The reason is because of the condensation that will form in the bottle when it thaws.

CA is moisture activated and when condensation forms inside the open bottle as it thaws, the CA will harden in hours.

Unopened bottles are fine (Most CA's are packed with a "Dry Gas" head in the bottle, so there's no chance for condensation. Once the bottle is opened... the CA is exposed to atmospheric moisture and will begin to slowly cure.

Now you know why your opened thin CA turns into thick after awhile on your workbench.

Craig