Stand for Epoxy Glue

I designed this stand for epoxy glue, because I need to keep the tubes in a upright position.

I often use very small amounts of epoxy glue. Thus I must mix equal small amounts of glue and hardener. That was very difficult, because every time air-bubbles of various sizes came out of the tubes in addition to the glue or hardener. How do you apply 2 equal drops of glue and hardener if the air-bubbles are larger than these? By keeping the tubes upright this problem disappeared.

Also there is