Tips For Using the Spray Nozzle
All of the foam kits are equipped with plenty of extra nozzle tips. If you stop spraying for more than 30-45 seconds or spray constantly for 6-8 minutes, the foam inside the tip will cure and harden. If you continue to spray with a blocked nozzle, the foam will back up into the gun and throw the pressure ratios off.
The tips snap on and off very easy so a replacement is very quick. Generally, the tips included are all you need unless you anticipate stopping and starting a lot. If this is the case, you can order extra tips when you order a kit for ease of mind.
Reusing Spray Foam Nozzle Tips
The nozzle tips can be reused if cleaned by placing in acetone right after being removed from the application gun. Also, a partially used kit can be stored for up to 5 to 6 days so you have the flexibility to complete a job on another day. To pack up just take off the old tip, confirm the little cavity is full of petroleum jelly, and put the old tip back on until you are ready to use it again. When you are ready to start anew, just rock the tank for a minute or so to mix the propellant well, snap a new tip on, and start spraying again. (NOTE: Recheck the temperature)
Releasing Spray Foam Pressure
These kits, especially the larger ones, are under pretty high pressure. So the further you pull back on the trigger, the faster the foam comes out. What you need to do is slowly increase your pull on the trigger to get the gun primed and the vortex in the tip right so the product mixes well or you end up spraying 'flat' foam that doesn't expand as much as it should because it isn't mixing right in the tip.
You really don't need to pull the trigger back any more than a quarter of the way for best control, at least until you get below half a tank. Then you'll have to pull back further on the trigger to get the same flow rate since there will be less propellant left. To put an inch on, you'll just pull back a quarter of the way on the trigger and move your arm at a pretty good speed to get an inch. To put 2 inches on, just move your arm a bit slower.
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