Do not spray all 45 cans in one go. Spray 2 inches, let it cure for 20 minutes, then spray another 2 inches. This allows the chemical reaction to breathe and maximizes expansion.
Place cans in warm water (100°F) for 10 minutes before use. Cold foam is viscous and expands less. how many cans of spray foam will fill a 55 gallon drum
So, the drum’s internal volume is about . Do not spray all 45 cans in one go
If you’re looking to fill a standard 55-gallon drum with spray foam insulation (the type from a typical aerosol can), the answer depends on the of the foam — but a reliable estimate is between 12 and 16 cans . let it cure for 20 minutes