I’ve used Menards, A and B cans in a kit.  Tanks need to be about 70 degrees to work properly and shake cans,  they have a thermostat on the tank.   Room needs to be warm and well ventilated and no furnace flame. Give off chemical gas when used. Foam drips so cover floor with plastic. Spray thin layers then repeat after foam expands. Kit has extra tips if you pause for a moment replace tip, and apply Vaseline included to inside of tip. Buy more than you think you’ll need.