Butyl 310

Butyl 310 is an elastomeric coating providing excellent UV protection and superb resistance to moisture penetration. Once cured, this sprayed applied polymer provides a durable, seamless, flexible waterproof membrane that resists cracking and will allow for the normal expansion and contraction. Butyl 310 is also a vapor retardant coating, making it ideal for use over spray polyurethane foam in cold storage or freezer applications.

  • Reduces daily expansion and contraction (thermal cycling) of roofing substrate
  • Reflects 80-90% of heat caused harmful UV rays
  • Excellent reflectivity
  • Superior elongation and tensile strength
  • Highly resistant to dirt collection

55-gallon drum, 5-gallon pail



Butyl 310 is recommended as a protective vapor barrier coating to most surfaces as well as roof applications, including a variety of situations such as polyurethane foam, seams, fasteners, gutters, vent pipe flashings, air conditioning units and expansion joints. Ideal for metal buildings that may contain visible rust.

Download Product Data SheetDownload Safety Data Sheet
  • Metal
  • Modified Bitumen
  • Single-ply
  • Smooth BUR

All surfaces to be coated must be cleaned properly. Power washing is recommended. Any existing coating must be checked for good adhesion. Before application, any loosely adhered coating must be removed and bare surfaces must be prepared, cleaned and checked for compatibility. Butyl 310 is a ready-to-use product. Thinning is not required or recommended.


This product contains VM & P Naphtha and Xylene. Keep away from heat, open flame or sparks. Use only in well ventilated areas with proper protective equipment. Avoid breathing vapor or mist. Approved (MESA/NIOSH) chemical respirator and protective clothing must be worn by applicator and personnel in vicinity of the application. Provide mechanical exhaust ventilation in enclosed areas. Positive pressure fresh air hose masks are required for interior applications.

Butyl 310 Spray Guide
  • Tank Spreader
  • Airless Sprayer
  • Roller
  • CRRC

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