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ClassicLiquid Primer 4kg

The ClassicLiquid system is a rapid curing polyurethane liquid membrane designed for overlaying existing roofing systems to create a durable and seamless waterproof layer. 

This 4 Litre ClassicLiquid Primer can be applied to many different substrates both porous and non porous and must be used prior to the use of ClassicLiquid Top Coats & Detailer.

Coverage rates will vary based on the existing roof porousity between 0.1 litres to 0.3 litres per square metre. Typically a semiporous surface will require 0.2 Litres / sqm meaning that this 4 litre tin will cover approximatey 20 square metres.


£49.95 Excl. VAT £59.94 Incl. VAT
£49.95 £59.94

Availability: In stock



Primeable Surfaces

Built Up Felt
Ceramic Tiles
OSB Decking and all other Timber surfaces
Recovery Boards
As a reactivation overcoat primer over ClassicLiquid products if these products require recoating outside of the 48 hours window. 


It is essential that the intended substrate is thoroughly cleaned with a high pressure washer, on smaller areas a stiff broom and soapy water and rinse will suffice. Remove all oil, grease and wax contaminants, cement laitance and loose particles.

Make good all cracks and blisters, fill surface irregularities with a suitable product. Allow to fully dry. Apply ClassicLiquid Primer at a sufficient coverage rate to seal the surface. Primer coverage rates will vary dependant on surface porosity Allow primer coat to fully dry. (approx. 2 hours but is dependent on ambient air temperature and humidity)

Why ClassicLiquid?

  • Very Competitively Priced
  • Fast Curing
  • Single coat (of membrane) application possible
  • Bubble free smooth finish
  • Easy to apply - due to lack of reinforcing fabric
  • Excellent weather & UV resistance
  • Will remain elastic down to – 40°c
  • Will not soften in high temperatures
  • High tensile and tear strength, excellent abrasion resistance
  • Showerproof in 30 minutes
  • Seamless finish
  • Trafficable in 24 hours

Additional Information

SKU CL-Primer-4
Weight (kg) 4.0000
Brand Name ClassicLiquid
Roofing System ClassicLiquid
Delivery Lead Time 1 Working Day