Glass Outerwrap, Protective Fiberglass Outerwrap by Denso

Glass Outerwrap, Protective Fiberglass Outerwrap by Denso
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Denso Glass Outerwrap is a fiberglass cloth impregnated with a water activated resin that is used as a protective outer wrap over Denso Petrolatum Tape. Also used as a pipe repair tape.


A protective fiberglass coating which offers exceptional mechanical and impact strength for underwater, underground, and above ground pipe and pipelines.


  • Resists cold and hot temperatures
  • Easy to apply, no mixing or messy clean up
  • Resistant to water, acid, salts, or soil organics
  • Can be applied underwater or to wet surfaces
  • Minimal surface preparation required
  • Quick, long term protective coating, ready for immediate service
  • Contains no solvents



Prepare surfaces by removing all loose scale, rust or other foreign matter in accordance to SSPC SP2 “Hand Tool Cleaning” or SP3 “Power Tool Cleaning”. High pressure water wash of 3,000 - 7,000 psi is also suitable. Spirally wrap a layer of Denso Petrolatum Tape with a minimum 1" overlap. For severely corrosive environments, a 55% overlap is recommended. While wrapping, press air pockets out and smooth all lap seams. Using rubber gloves, remove the Denso Glass Outerwrap from the hermetically sealed foiled pouch and soak in temperate water (salt or fresh) for 20 to 30 seconds. Remove and begin wrapping tightly, overlapping a recommended 50%.

Irregular surfaces such as valves, flanges, etc. may require the use of Densyl
Mastic or Denso Profiling Mastic. Refer to the product sheets for these specific
products for information on application and selection.