use what you need, and done. when it cures in the nozzle, it leaves a small section of dried material at the tip. if one lets about 1/8" or so out of the tip, all you need to do is pull it out and you are good to go again.
i'm not sure if it is available in any other packaging, as i thought this was a good all around way to dispense it, so i didn't bother to see if any other method was available.