VFI®-#11 9:1 Epoxy Primer

VFI®-#11 9:1 Epoxy Primer

VFI-#11 9:1 Epoxy Primer is a two component, water-based, general use roof primer that adheres well to a variety of substrates. The primer is one part of a full commercial roof restoration system and acts as an adhesion promoter for silicone, acrylic, or urethane roof coatings. Applying VFI’s industry leading epoxy primer is important for increasing the bond of liquid applied roof coatings to any substrate and helps to protect your project from future failures. 

VFI-#11 9:1 Epoxy Primer from VFI is an industry-leading primer that promotes adhesion of fluid applied roof coatings on commercial roof surfaces.

Features & Benefits

  • Most trusted epoxy primer on the market – 20+ years of selling a field-proven, quality product
  • Convenient packaging – A & B side are combined and mixed in a single 5-gallon bucket without the need for measuring or an additional bucket
  • Non-toxic & VOC compliant – exceeds EPA standards
  • Distinct color – easily detect where more coverage is needed while priming or during top coat application
  • Excellent adhesion characteristics – penetrates and seals surfaces to enhance the bonding of top coats to almost any substrate
  • Level cured surface – allows for easy next coat application

Instructions for Use:  

Surface Preparation 

Surface should be cleaned, prepped, and free of oils, dirt, or films that may prevent adhesion. Power wash as needed. Repair or replace any damaged areas on the roof including drains, vents, flashing, seams, etc. Areas with mildew, fungus, or algae can be treated with a concentrated chlorine solution. Cleaning agents should be rinsed off the roof. Allow the roof to dry before priming.  


Mixing is required before use. The A side should be premixed before adding the B side. Mix times may vary based on the volume and mixing method. VFI-#11 9:1 Epoxy Primer may be applied to the roof surface via sprayer, roller, or brush. It can be applied between 50°F – 120°F, but the temperature must remain above 50°F until cured. Rain or moisture cannot be present during application. Application should be stopped a minimum of two hours before rain or when the relative humidity is reached.  

Apply primer at a minimum of .25 gallons per square. Check specifications for required wet and dry film thickness. Allow the primer to cure for a minimum of 8 hours before topcoat application. Cure time may vary depending on temperature and humidity. If recoat is needed, it should be applied the next day or within 48 hours.  


Clean all tools and equipment including brushes, rollers, pump equipment, spray guns, and spray lines with water. If material has cured on equipment, use mineral spirits or a similar cleaning solvent.  


*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-#11 is not UV color stable and has no long-term UV testing. As a water-based product, it should be protected from freezing. A topcoat must be applied to the primed surface within 48 hours after curing.  

  • Incompatible materials – strong oxidizers, nitric acid, and sulfuric acid for B side
  • Conditions to avoid – heat. Also, incompatible materials and open flame for B side
  • Chemical stability – stable under normal storage conditions. B side may form flammable/explosive vapor-air mixture
  • Reactivity & hazardous reactions – no dangerous reaction known under normal use
  • Hazardous decomposition products – may include, and are not limited to, oxides of carbon

Potential Health Hazards 

  • May cause respiratory tract irritation.
  • May cause stomach distress, nausea, or vomiting if swallowed.
  • May cause skin irritation or sensitization: redness, edema, drying, defatting, cracking of the skin, or allergic reaction.
  • May cause eye irritation or serious eye damage: discomfort, pain, redness, swelling, excess blinking and tear production, or swelling of the conjunctiva. May also cause burns.    

*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
  • Brush Brush
  • Roll Roll

Available Packaging:

  • 5 Gallon
  • 1 Gallon