What is the difference between gaffer tape and duct tape? 

Although they are similar, gaffer tape and duct or cloth tape are manufactured from different materials and are used for different purposes.

Gaffer’s tape has a vinyl coating whereas duct tape is coated in Polyethylene (PE). The two types of tape have a distinct appearance; while gaffer tape has a matt finish thanks to its vinyl coating, duct tape is highly reflective. Duct tape is also often stronger and tougher than gaffer tape when it comes to the adhesive used.