VFI®-6171 70 D Qwik Spray Hard Coat

VFI-6171 70 D Qwik Spray Hard Coat is a two-part, user-friendly, polyurethane cartridge system that uses the portable, cost-effective VFI-7500 Qwik Spray Gun. It is designed as long-lasting protection for theming sculptures, parts, and components. Since the Qwik Spray System® is portable, VFI-6171 can also be used for on-site touch-up work or bonding large pieces together. It is mainly used as a durable protective layer over foam for interior applications that require fire testing. Once cured, the coating can be sanded and painted to make repairs or improve aesthetics on any project.

70 D Two part spray urethane with Class A fire testing and self leveling properties. Comes in the QWIK SPRAY SYSTEM®.

Features & Benefits

  • Qwik Spray System – convenient and hassle-free setup allows for cost-effective, portable application
  • Impact resistant – 70 D hardness provides a rigid layer that protects against high-impacts
  • Fire retardant formula – passes ASTM E84 testing for indoor and outdoor use
  • Easy cleanup – no cleaning solvents required; simply throw away the cartridges once empty
  • Improve project aesthetics – theming designs and fabrications can easily be sanded and painted
  • 100% solids – contains no VOCs for an environmentally safe solution
  • Cartridges designed for use with VFI-7500 Qwik Spray Gun

Instructions for Use:  

Surface Preparation  

Application method and type of substrate will yield more detailed surface preparation. Remove any contaminants from the surface that may affect the product’s adhesion, including dirt, debris, and oils. Some substrates may need a primer before applying the hard coat. The surface should be dry before spraying. If spraying on EPS foam, make sure the foam is aged at least 30 days to allow for any gas to escape. 


Bring the product to a minimum temperature of 65°F before use. As a cartridge system, VFI-6171 does not require mixing, except if the material is visibly separated, which would require shaking the cartridge until uniform. While using the Qwik Spray System, the temperature should be between 40°F – 120°F. If the temperature passes 72°F, the speed of the cure will increase.  

VFI-6171 requires a low-pressure, plural component spray applicator gun such as VFI-7500, which can hold 750 mL dual cartridges. To run the Qwik Spray Gun, an air compressor that can provide dry air and a minimum of 100 PSI and 10 CFM of constant pressure is also required.  

Once you start spraying, you cannot stop until the cartridges are empty. For smaller projects, applying 40-80 mils of coverage is recommended. If the project is for outdoor use, apply a thicker coat between 60-120 mils, especially when high impact is expected. Once the coating has cured, it can be sanded, primed, and painted to provide the desired aesthetic. Sanding should be done to increase the adhesion of any subsequent coats or to provide a smooth, consistent finish for priming and painting. If subsequent coats are needed, apply them within the 20-minute recoat window for ensured adhesion.

Qwik Spray Coverage Chart

10 sqft15 sqft20 sqft25 sqft30 sqft35 sqft40 sqft45 sqft50 sqft60 sqft70 sqft80 sqft90 sqft
1 tube60 mil40 mil
2 tubes120 mil80 mil60 mil48 mil40 mil
3 tubes120 mil90 mil72 mil60 mil51 mil45 mil40 mil
4 tubes120 mil96 mil80 mil69 mil60 mil53 mil48 mil40 mil
5 tubes120 mil100 mil86 mil75 mil67 mil60 mil50 mil43 mil
6 tubes120 mil103 mil90 mil80 mil72 mil60 mil51 mil45 mil40 mil


Cleanup for a cartridge-based hard coat system is much easier than high-pressure systems. All you need to do is remove the cartridges from the applicator frame and throw them away. Never soak the gun in a cleaning solvent. If there is residue on the spray gun, you can use xylene or MEK to wipe it off before it fully sets. 


*Always read the safety data sheet before working with chemicals 

Use chemicals only as directed and for their intended purpose. Do not dispose of chemicals down the drain. Most chemicals must be disposed of as hazardous waste.   

PPE to avoid all unnecessary exposure:  

  • Eye protection – wear approved safety glasses and any additional eye protection as necessary 
  • Hand protection – wear chemically resistant protective gloves (nitrile, butyl, or neoprene) 
  • Skin and body protection – wear suitable protective clothing 
  • Respiratory protection – in case of insufficient ventilation, wear suitable respiratory equipment. Respirator selection must be based on known or anticipated exposure levels, the hazards of the product, and the safe working limits of the selected respirator 

Product Limitations  

VFI-6171 is not UV color stable and has no long-term UV testing. The product contains isocyanate, which may be irritating when in contact with the skin and is toxic when inhaled. Avoid breathing in vapors or repeated skin contact.  

  • Incompatible materials – A side: strong bases, acids, alcohols, amines, and water. B side: oxidizers 
  • Conditions to avoid – heat and incompatible materials 
  • Chemical stability – stable under normal storage conditions 
  • Reactivity & hazardous reactions – no dangerous reaction known under normal use 
  • Hazardous decomposition products – may include, and are not limited to, oxides of carbon. Also, oxides of nitrogen and isocyanates for the A side  

Potential Health Hazards  

  • May be harmful and cause stomach distress, nausea, or vomiting if swallowed.  
  • Causes skin irritation and sensitization: redness, edema, drying, defatting, and cracking.  
  • May cause respiratory tract irritation. A side may also cause allergy or asthma symptoms or breathing difficulties.  
  • Causes serious eye irritation: discomfort, pain, excess blinking or tear production, marked redness, and swelling of the conjunctiva.  

*If you are experiencing any of these symptoms, seek medical advice or attention. Call a poison control center or doctor if swallowed. 

Application Methods:

  • Qwick Spray

Available Packaging:

  • Cartridge