For workers who usually use resin as their work, of course, they often throw away the rest of the resin because it has been stored in the bottle for too long and become resin expired.
Resin that is stored in a place that is not airtight, even if only slightly, will change the condition of the resin to become viscous more quickly. But resin also has a time limit until it thickens on its own because it has a property called curing time.
So after all the resin in liquid form will not last long. If you want it to be stored for months, it must be in powder or solid form.
Resin that has not yet solidified but is too thick can still be used for purposes that do not require aqueous materials, such as machete handles or knife handles.
In my video below, I use resin that is already thick to make a machete handle. Its strength is better than that of wood which progressively deteriorates.