Spray Foam Insulation: How to Save Unused Spray in a Can

The chemicals in spray foam insulation should always be properly disposed of according to the manufacturer’s instructions before they reach their expiration dates. However, a spray foam kit does not usually have to be exhausted in one day. It can often be used over the course of 1 or 2 weeks. Read on to learn what you need to do if you must spread your insulating project out over the course of a few days.

Prevent Clogging

If you must leave a partially used tank of spray foam unused, do so for no longer than one week at a time. Prevent the gun, its trigger and the tank valves from clogging by using the petroleum jelly included in your kit.

The face of the gun should be coated with a copious amount of jelly. Also apply jelly to the trigger of the gun and to the valve stems of the tank. Close the valve stems of the tank before letting the tank sit.

Use a New Nozzle

When you are ready to continue your project, make sure that you replace the old mixing nozzle of the gun with a new one.


After opening the tank valves, test spray for a few seconds to make sure the foam is still of high quality. If you have taken care to prevent clogs, you should be able to continue your work with no problems.