VFI®-6170 70 D Spray Hard Coat

VFI®-6170 70 D Spray Hard Coat

VFI-6170 70 D Spray Hard Coat is a fast-setting, two-component, spray-applied polyurethane coating for theming and industrial design. When sprayed thick, the coating provides a durable, protective shell-like layer over structural shapes, 3-D sculptures, or other entertainment props primarily made with EPS foam. It is meant to be used by trained professionals who are familiar with high-pressure spray equipment. VFI-6170 is great for interior applications where Class A fire testing is necessary. The coating cures in seconds, so it can be sanded and painted shortly after spraying to achieve the desired finish and aesthetic. 

VFI-6170 70 D Spray Hard Coat from VFI is a fire-tested theming hard coat that forms a durable shell over structural shapes, 3D sculptures, and other props.

Features & Benefits

  • Easy spray application – provides fine detailing and less sag on verticals for theming designs and fabrication
  • 70 D hardness – provides a highly rigid surface that is resistant to impacts
  • Easily sandable – create a desired finish to paint over and improve aesthetics
  • ASTM E84, Class A fire tested – meets strict indoor and outdoor fire safety requirements
  • Fast cure – cures to touch in 20 seconds and cures to handle in 2-3 minutes
  • 100% solids – contains no VOCs or solvents and is environmentally safe

Instructions for Use:  

Surface Preparation  

How you prepare the surface to apply the hard coat will depend on the substrate. The surface should be clean and free of dirt, dust, debris, or other contaminants to ensure proper adhesion. Some substrates may need a primer before coating. If spraying over EPS foam, the foam must be aged at least 30 days so any gas can escape. Poor surface preparation will affect coating performance. Ensure that the surface is dry before you begin spraying. 


Bring VFI-6170 70 D Spray Hard Coat to a minimum temperature of 65°F and premix the Poly (B side) components before use. The time it takes to mix the product until it is uniform will depend on the mixing method and the volume of the product. Make sure the temperature stays between 40°F – 100°F. If the temperature passes 72°F, the speed at which it cures will increase.  

Using a high-pressure, plural component spray rig, apply an average of 40-80 mils to the surface. If the finished piece is to be placed on the ground or in a high-traffic area, then extra coating is required to increase impact resistance. VFI recommends applying the hard coat at a rate between 60-120 mils for most heavy-duty projects. If more coats are needed, apply them within the 20-minute recoat window. Adhesion issues may occur if subsequent coats are applied past the 20-minute mark.  


After application, clean your tools and spray equipment with xylene or MEK. Flush the cleaning solution through spray lines to prevent any material from clogging the equipment.  


*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 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-6170 is not a UV color-stable product and has no long-term UV testing. This product contains isocyanate, which can be irritating to the skin and toxic if inhaled. Avoid prolonged breathing or 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 cause stomach distress, nausea, or vomiting if swallowed.  
  • Harmful when in contact with skin. May cause skin irritation or sensitization: redness, edema, drying, defatting, and cracking. 
  • May cause respiratory tract irritation. A side may also cause allergy or asthma symptoms and breathing difficulties.  
  • Causes serious eye irritation: discomfort, pain, excess blinking and 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:

  • Spray Spray

Available Packaging:

  • Tote
  • Drum
  • 5 Gallon