Fastflash is a flexible, self-adhesive elastomeric membrane. The product is UV-stable and can also be applied to steel for protection against corrosion.


Properties of Fastflash
Can be used to waterproof the following:

  • Counter flashing
  • Ridge cappings
  • Box gutters
  • Flat roof repairs
  • Counter flashing for torch-applied membranes


  • Quick and fast application
  • No heating required
  • Can be coated with an acrylic waterproofing liquid
  • Flexible

Surface Preparation

  • Ensure that the surface is dry and sound
  • The surface should be free of dust, grease and algae
  • Remove any flaking paint


  • Prime the surface where FASTFLASH is to be applied using WJ UNIPRIME
  • After FASTFLASH has been applied to the desired area, a coat of acrylic waterproofing paint can be applied to complete the application

Available Sizes

  • 100mm x 15m
  • 150mm x 15m
  • 200mm x 15m


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