NBS Source


Sikafloor® 31 PurCem is a three component, solvent free, coloured, matt finish, polyurethane coating with excellent chemical resistance and very good resistance to abrasion and mechanical damage. Also suitable for use as a seal coat to Sikafloor® 20 and 29 PurCem.

Suitable areas of application:

  • Dairies and food plants.
  • Pharmaceutical plants.
  • Containment areas.
  • Heavy engineering.
  • Chemical process areas.


The cementitious substrate should be sound and of sufficient compressive strength (minimum 25 N/ mm²) and pull off strength (minimum 1.5 N/mm²). The surfaces must be dry and free of all contaminants, e.g. oils, grease, surface treatments and coatings, etc. The substrate must be prepared mechanically to achieve an open textured fine gripping surface, free of cement laitance. Weak concrete should be removed and surface defects such as blowholes and voids must be fully exposed. All dust, loose and friable material must be completely removed, preferably by brush and vacuum, from all surfaces before application of the coating. Prior to application, confirm substrate moisture content.

General information

Specification data - Smoothing and levelling underlay compounds

Product Reference

Sikafloor® 31 PurCem

Resin flooring


Number of coats



Nominal thickness

200–250 micrometres/ coat

Surface finish/ treatment

Not required

Standard product features


A short nap roller is used, ensuring that the coating fully wets the concrete surface. If applying on Sikafloor® 161 ensure the correct overcoating time and substrate moisture contents are observed.

Product Options


Only required on excessively porous substrates. Consult manufacturer for type.

Number of coats:

Sikafloor® 31 PurCem is typically applied in two coats.


Refer to colour chart. Consult manufacturer for details.

Similar products from Sika Limited

Sikafloor® 20 PurCem

Sikafloor® 20 PurCem

Sikafloor® 21 PurCem

Sikafloor® 29 PurCem

Sikafloor® 81 EpoCem

Sikafloor® 81 EpoCem

Sikafloor® 91

SikaLatex® Ultra