STOPGAP 500 is a rapid drying floor finishing compound providing a smooth surface to plywood, existing floor smoothing under layments, sand / cement screeds, calcium sulphate screeds and other rigid dry absorbent surfaces, prior to the installation of floor coverings.

STOPGAP 500 is dimensionally stable and is supplied as a pre-blended dry powder, which is designed for Micro-Coat application to a feathered edge. It is protein-free which allows it to be used in biologically sensitive areas.

An 8kg unit of STOPGAP 500 mixed with 4.5 litres of clean water will cover approximately 8m2 at a thickness of 1mm

No priming is necessary

General information

Uniclass 2015

Pr_35_31_06_80 Smoothing and levelling underlay compoundsPrimary


M51/110 Carpeting

Specification data - Smoothing and levelling underlay compounds

Product Reference

Stopgap 500

Product Options

Technical properties:

  • Class (to EN 13813:2002): CT-C16-F6.
  • Working time at 20°C: 15–20 minutes.
  • Setting time at 20°C: 25 minutes.
  • At 3 mm ready to receive floor smoothing compounds: 25 minutes
  • Consumption per mm thickness: 1kg/m².

Compressive strength (N/mm², to EN13892-2):

  • 1 Day: >5.0
  • 7 Days: >10.0
  • 28 Days: >16.0

Flexural strength (N/mm², to EN13892-2):

  • 1 Day: >2.0
  • 7 Days: >4.0
  • 28 Days: >6.0


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