Why is glue sticky?
Although there are many ingredients used to make glue, most formulas contain something called polymers. A polymer is a large molecule that often is described as being a long molecular strand. Some polymers are naturally "sticky" depending on how they are made. Others require certain ingredients to be added in order to make them sticky.

Why doesn’t glue stick to inside of the tube?
As long as the glue remains inside the tube away from air it will remain fluid. Glue hardens when there is a loss of water from the formula. Exposure to the atmosphere will cause the water to evaporate and make the glue harden. That’s why it is important to keep the cap on the glue bottle closed to prevent hardening or drying out.


How does 2-component (epoxy) glue work? 
The two halves of epoxy glue are: resin (composed of relatively small molecules) and a catalyst (which initiates and speeds up the reaction).  The reaction that happens involves the joining together of smaller molecules, plus reacting them with oxygen-containing compounds, to form a “polyether resin.” This resin is nice and hard, and very stable.


The cap on my glue bottle is clogged, what should I do?
If you do have a clogged tip, remove it from the bottle and soak it in a solution of warm water and soap until it opens up. Do not try to clean the tip with a sharp object as you might damage it permanently.
Always be sure to twist the glue cap closed after using. Wipe off any excess glue so that it will not clog.


What if my fingers get stuck?
Don't worry.  For ordinary glue just soak the bonded area in warm, soapy water. Carefully peel or roll the skin apart gently and slowly.  For Super glue or epoxy glue use acetone or ordinary nail polish remover containing acetone on the bonded area. The bond will break but be sure to rinse the area thoroughly after de-bonding.