I keep all my 2 ounce "refill" CA in the fridge and bought a bunch back when Tower Hobbies used to have the stock up sales on CA. I never cut the tips open on those bottles. I always unscrew the cap and poor it into the 1/2 ounce bottles I use during a build. I squeeze the bottle to remove as much air as possible before screwing the cap back on. Since I started using Superphatic I use so little CA now that I still have CA in the fridge several years old and still usable.