Explore our brands

Have a question about our products or can't find what you're looking for ?

Contact Us
Back to product listing
Epoxy Primer for Porous Substrates

CS175 is a two part water based epoxy primer.

CS175 Epoxy Primer for Porous Substrates provides a breathable sealer for calcium sulphate screeds.  Additionally, it is suitable for priming new and existing cementitious screeds, concrete, brick and blockwork.  May be used as a low viscosity primer for epoxy paint coatings on prepared power floated concrete.

  • Excellent coverage
  • Low viscosity
  • Consolidates weak surfaces


  • Surfaces should be clean, firm and free from dust, dirt or other material liable to impair adhesion.

Application Conditions

  • New concrete should be a minimum of 28 days old.
  • Surface temperatures should be +3°C above the dew point.
  • Temperatures should be above +5°C at time of application and for 24 hours thereafter.
  • Do not apply over wet substrates or externally if rain is expected prior to curing.
  • Where used internally, especially in high humidity conditions, forced ventilation will be required to assist curing.
  • At lower temperatures and in internal situations, allow a minimum of 24 hours, before overcoating.
  • If contaminated before installing floor finishes, it will be necessary to sand the surface of the primer and reapply one or two coats as required.


  • Add contents of Part A (small bottle) to Part B (large container) and mix thoroughly for a minimum of 2 minutes.


Concrete and Sand Cement Screeds

  • Apply an even continuous coat, which is free of pinholes to the substrate using a fluff free roller.
  • Take care to prevent the formation of puddles. On smooth impervious substrates, application by squeegee is the most effective way to quickly obtain a uniform film.
  • Leave the coating to dry to a translucent film (usually 3 to 6 hours depending on substrate, temperature and ventilation). If in doubt, leave overnight.
  • Once dried, the primed surface is ready for overlaying and must be kept free of contaminants.
  • If more than 24 hours have elapsed since the application, then a repeat application of the primer may be required.

Calcium Sulphate Screeds

  • Prepare all surfaces by mechanical techniques as recommended by the screed manufacturer to provide a clean, sound, smooth contaminant free surface with a fine texture.
  • Remove all traces of dust and debris.
  • Apply 1 or 2 coats of mixed CS175 Epoxy Primer for Porous Substrates (as required) and allow each coat to dry (usually 3 to 6 hours depending on substrate, temperature and ventilation).
  • Once the calcium sulphate screed is dry (Refer to specific manufacturer’s instructions) Secure the floor covering with the approved TREMCO adhesive.



Technical data

CompositionA two part water based epoxy primer
Pot LifeApproximately 45 minutes
Curing Time (in good drying conditions at +15°C or above)Overnight
Coverage10 m² per kg depending on the substrate and method of application
StorageStore in shaded dry conditions between +10°C and +35°C
Shelf Life12 months when stored as recommended in original unopened containers
Speak to an Expert

Product Finder

Application Area