(FNS100, FNS200, FNS300, FNS350, FNS500, FNS550, FNS800, FNS850)

Polyurethane foam sealants and adhesives are extremely sticky and very difficult to remove. Avoid skin contactAlways read and follow the foam sealant and adhesive manufacturer’s product instructions. Always wear protective gloves and safety eyewear. Wear appropriate clothing that you do not mind trashing after the project and do not wear jewelry (rings, watches, etc).

• Shake foam canister for 1-2 minutes before dispensing foam and in between uses.

• Lightly apply petroleum jelly, Teflon (PTFE) lubricating grease to the screw threads of both the foam canister and the dispensing tool canister adapter basket. It makes it easier to thread and prevents foam from sticking to the canister plastic thread making removal of foam canister easier. Do not apply any grease or lubricant to the foam intake valve.

• Turn foam canister upside down and align the plastic canister screw threads to the threads of the gun. Screw the foam canister slowly onto the dispensing tool canister adaptor. Remove foam canister and try again if the canister does not thread easily. Do not apply excessive force to get the canister to thread onto the tool adapter as cross-threading could result in a poor seal between the canister and the gun adapter leading to foam leakage under the adaptor valve. This is the most common mistake causing foam to leak and is not the result of a defective foam gun. If foam canister does not thread easily, try a new foam canister, as the plastic canister screw threads may be defective during manufacturing.

• When a foam canister is attached, the gun cavity is pressurized with foam.  Turn flow control knob on the back of the tool counterclockwise about two to three turns to an open position. Press trigger to dispense foam. Do a test foam shot on a large piece of paper or into a waste plastic bag. Use the flow control knob to adjust the foam bead size. Turn the control knob clockwise to reduce the flow to create a thinner foam bead size. Bead size can be controlled from 1/8″ to 3″ (3 mm to 76 mm). Turn knob counter clockwise to get a thicker foam bead size or foam output. Note: Foam N’ Seal FNS100 uses the tool trigger pressure to increase or decrease foam output (no control knob).

• Do not overfill gap or opening. Fill opening partially full to allow foam to expand. Once foam is cured, trim off excess foam. For hard to reach areas, use the plastic extension straw or cone tip.

• Turn the foam flow control knob on the back of the foam dispensing tool clockwise until fully screwed in. The trigger will be locked and foam will not dispense in this position. Note: Foam N’ Seal FNS100 is not equipped with a foam control knob and will not lock the trigger to prevent accidental foam discharge. Care must be taken to prevent accidental foam discharge.

• Use foam canister within 30 days of initial use (7 days for Foam N’ Seal FNS100). Store canister upright between uses with the dispensing tool attached.

• To reuse tool, scrape off any cured foam from the tip of the foam dispensing tool. Do not use a knife to scrape the tool tip. This can cause damage to the Teflon coating or the dispensing rod inside the tip. Failure to remove any cured foam will result in foam not dispensing or inconsistent foam bead or reduced foam output. Turn flow control knob counterclockwise to an open position by turning the knob. The tool is ready for use.

TipTo prevent foam from hardening on the tool tip use acetone or alcohol wipe to remove uncured foamClean tool tip every 10 minutes while in use and repeat the clean up process before tool storage.


• When a foam canister is empty, tighten the gun foam control flow valve to shut it. Before changing foam canisters, shake the new foam canister for 1-2 minutes.  Apply petroleum jelly, silicone or Teflon (PTFE) lubricating grease to the new foam canister plastic treads. Remove the empty canister by unscrewing counterclockwise to remove it from the foam adaptor basket. Clean the adaptor basket of uncured foam with a pressurized can of foam cleaner such as Great Stuff Pro Gun Cleaner. Always read and follow the foam cleaner manufacturer’s recommendations for proper usage.

• Screw on a new canister of foam immediately after cleaning the adaptor basket to avoid the foam from hardening in the dispensing tool adapter. Press the trigger to fill the foam dispensing tool with foam. Uncured foam on the gun surface may also be cleaned by using a paper towel with acetone or alcohol.


• Partially used foam may be stored with the gun attached for about 30 days. Close the foam control knob shut by turning it clockwise until shut (gun trigger cannot move).

• When transporting the dispensing tool with foam canister attached, the gun foam control knob must be shut and it must be secured properly to prevent it from moving around. Failure to secure the tool may damage the tool resulting in foam being discharged. Do not expose foam canister in direct sunlight especially in a closed vehicle in hot weather above 110ºF. Failure to follow the foam manufacturer’s storage recommendations my result in undesirable discharging of pressurized foam in the vehicle. It is extremely difficult to clean uncured and cured foam. Do not transport Foam N’ Seal FNS100 with foam canister attached in a moving vehicle. It does not have a shut off knob and may result in foam discharging during transportation.


• For storage of the tool without attaching a foam canister, all liquid foam inside the foam gun must be removed. This can be achieved by attaching a pressurized acetone foam cleaner such as GREAT STUFF PRO Gun Cleaner and flushing the tool until it is completely free of liquid foam (no foam comes out of the gun tip). Remove tool cleaner canister and drain the remaining tool cleaner solution. Use the spray gun cleaner to clean the rest of the tool making sure there’s no liquid foam on the adaptor basket and valve. Store gun in a cool, dry place. Failure to observe these steps will result in an inoperable tool if foam hardens inside the tool. If the tool is inoperable, it usually means the tool was not cleaned properly and not because the gun is defective.

• Partially foam canister may be stored for later use. Make sure to clean and remove liquid foam from the canister plastic thread assembly including the valve by spraying acetone. Once the foam on the canister foam is cured on the canister thread assembly, the partial can of foam cannot be reused. Note that all foam products have an expiry date.

• Never store the dispensing tool with a canister of foam cleaner (acetone) attached to the tool.

• NEVER USE WATER TO CLEAN THE FOAM DISPENSING TOOL. Once the foam has cured inside the dispensing tool, acetone or solvent will not dissolve the foam and the gun is useless.


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