Nelson Aero-Spot Tree Marking Aerosol Paint 4-6 year duration provides the ultimate in ease of application. It does not require transfer of a tree marking gun from one can to another. Simply shake the can to ensure proper preparation, spray until the marking job is complete, and then dispose of the empty can in a responsible manner. Nelson Aero-Spot Tree Marking Aerosol holds 12 oz of paint and is available in 18 colors.