Epoxy putty

Epoxy putty refers to a group of room-temperature-hardening substances used as space-filling adhesives.

Unlike many other types of glues, an epoxy adhesive can fill gaps, and even be moulded into a structural part.

Some makers claim in advertising that one can drill and tap their cured products and that they quickly cure "hard as steel" (as measured by Shore rating), though they are much weaker than steel in tensile strength and shear strength.

The most common variety of epoxy putty used in modelling has its component clays coloured yellow and blue, respectively, and the mixed, hardened end product is green.

This has given rise to the colloquial name green stuff for epoxy putty.