VFI®-425 High Pressure Foundation Spray Coating

VFI®-425 High Pressure Foundation Spray Coating

VFI-425 High Pressure Foundation Spray Coating is a fast setting, 100% solids polyurea hybrid with excellent tensile strength. When applied before backfilling, the coating creates a seamless, long-lasting barrier that waterproofs commercial and residential foundations. The membrane’s low permeability prevents water from penetrating into the foundation walls. As a polyurea hybrid, it has excellent chemical resistance and will not degrade underground. VFI-425 is an exterior defense for the foundation and provides the durability required to lengthen the life of the structure. 

VFI-425 High Pressure Foundation Spray Coating from VFI is a fast setting polyurea hybrid used to protect and waterproof building foundations.

Features & Benefits

  • Excels at waterproofing porous surfaces
  • Provides a long-lasting, durable barrier of protection
  • Easy to use, fast setting material for a quick return to service
  • Excellent chemical resistance to prevent coating degradation
  • Solids content allows it to retain 100% of its thickness after curing

Instructions for Use:  

Surface Preparation 

Clean all surfaces so they are free of contaminants such as oils, dirt, and films that could affect the coating’s adhesion. Loose particles can be brushed off or washed off with a power washer. Protrusions must be removed, and existing holes, cracks, or chips should be repaired. To achieve an acceptable surface for coating, you can sandblast or shot-blast smooth or contaminated concrete. New concrete must be dry and should be aged at least 28 days. VFI recommends using a primer such as VFI-1007 to seal porous surfaces.  


The Poly (B side) material must be premixed until uniform. Both A and B side materials must be brought to a minimum temperature of 65°F before spraying. The surface temperature should be between 40°F – 100°F during application.  

Use a high-pressure, heated plural component spray rig capable of 2,300-2,500 psi and temperatures between 130°F – 150°F to apply the coating. VFI requires an application of at least 40 mils to get the proper permeance. If additional coats are needed, they must be applied within the 2-hour recoat window. A foundation can be coated and backfilled the same day for a quick return to service.  


VFI’s preferred cleaning solvent is xylene or MEK. When flushing spray lines, we recommend the VFI-8005 Pump Flush to remove the material from the hoses. 


*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-425 contains isocyanate in the A side, which is irritating to the skin and toxic if inhaled. Avoid prolonged breathing of vapors and repeated skin contact. It is UV resistant but will fade over time.  

  • 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 as well as oxides of nitrogen and isocyanates for the A side 

Potential Health Hazards  

  • May cause stomach distress, nausea, or vomiting if swallowed. 
  • May cause respiratory tract irritation. The A side material may cause allergy and asthma symptoms or breathing difficulties if inhaled. 
  • Causes skin irritation or sensitization: redness, edema, drying, defatting, and cracking of the skin. Repeated exposure to the B side material can result in absorption through the skin, causing a significant health hazard. 
  • 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