Bottles .
Are you Bottled up ?
How many empties do you have ?What shape and size are they ? Are they the Testors round half-ounce bottles ? Those are the best .Why ? well they fit most internal mix airbrush caps .
When you get to the bottom all is not lost . Carefully mix the remnants with Thinner and shake vigourusly .This will get most of the residue out .You may have to do this more than once especially with the Reds , blacks and dark Blues and Greens .
Clean the threads of the bottle with an X-Acto blade carefully even the groove at the rim . Now the top .You can , after letting a drop or two of lacquer thinner soak in it , clean it out almost like new . Use a wooden cuticle pusher obtained from Sally's or other beauty supply house .
Carefully work the remnants out until the cap inner surface and the seal insert are clean . Then wash the whole thing , Bottle and cap, with soapy dish water .I prefer dawn because it does not leave any residue when fully rinsed .Air dry on a paper towel and then cap , put away till needed .
You can also use Empty Testors or other brand Glue Bottles for storing much more paint for a large build. Again clean and dry with soapy water and let air dry . T.B.
As far as the seal insert on the Glue Bottles, just cut off the brush holder in the middle , BUT , keep that seal !