Alien Epoxy (Fallout 3)

Alien epoxy is an item which is added to Fallout 3 in the Mothership Zeta add-on.

Uses
It can be used to increase the condition of the currently equipped weapon, up to a maximum of 100%. Earth weapons are extremely rare aboard the ship, so the epoxy is the only alternative to repair weapons brought aboard. The percentage repaired depends on the user's Repair skill:

Alien epoxy comes in tubes and over 100 tubes can be found in Mothership Zeta. Since they have no weight, all tubes found can be carried without being over-encumbered. While the effect of one tube may not conform to the table above, it is always possible to increase a weapon's condition to 100% by applying multiple tubes consecutively, regardless of a character's Repair skill.

Alien epoxy cannot repair armor or clothing. However, it does increase DR (damage resistance) by 10 points for 1–12 in-game hours.

Behind the scenes
An "epoxy" is a step-growth thermoset polymer that solidifies around the applied area, such as glue.