Product Codes

  • Grey 30620337 - 20kg bag
  • White 30820338 - 4.3L pollyjerry


Approx. 5m2 per bag at 2mm to 3mm depth (depending on the smoothness of the floor surface & application technique)
30620337 - 20kg bag 30820338 - 4.3L pollyjerry
Blend of cement and latex liquid
+5°C to +25°C
SL C500 Ultimate Latex Liquid
0mm to 10mm
Up to 15 minutes after mixing (depending on ambient temperatures)
Foot traffic: approx. 1.5 hours. Loose lay textile floor coverings: approx. 8 hours. Bond floor coverings: approx. 12 hours. On non-absorbent subfloors lay floor coverings: approx. 24 hours (<3mm depth at +20°C, depending on ambient conditions).
Store and transport securely. Store for up to 6 months from date of manufacture in original, unopened packaging, clear of the ground, in cool, dry conditions within the temperature range +5°C to +25°C and out of direct sunlight. Protect from excessive drafts, frost, damp, condensation and dew
Powder and liquid

Key Features

Moisture tolerant
Protein-free and Low-odour
Suitable for use over some adhesive residues


Bostik SL C500 ULTIMATE is a two-part, cementitious underlayment for smoothing uneven floors prior to laying decorative floor coverings. It has excellent workability & flow characteristics and can be trowelled to a feather edge.

For the smoothing and levelling of uneven subfloors before laying decorative floor coverings. Bostik SL C500 ULTIMATE can be laid over most common substrates including concrete, sand/cement screeds, stone, anhydrite screeds, rigid metal, terrazzo & quarry tiles, asphalt and other strong, rigid subfloors. Bostik SL C500 Ultimate should not be used over old tackifiers or water-soluble residues.

Bostik SL C500 ULTIMATE is totally protein-free and is suitable for use in biologically sensitive areas. The low-odour formulation makes Bostik SL C500 Ultimate ideal for use in occupied buildings. The moisture tolerant formula enables Bostik SL C500 ULTIMATE to be used to smooth rough, textured subfloors prior to the application of Bostik Screedmaster damp proof membranes.

It is suitable for use with warm water underfloor heating systems, provided a surface temperature of +27°C is not exceeded, and in areas of high solar gain. It is not to be used as a wearing surface and should always be covered with a floor covering. For interior use only.

Case Study
Bostik – Flooring in Healthcare
Bostik – Flooring in Healthcare
Technical advice and quality subfloor preparation products and flooring adhesives from Bostik are said to have enabled the progress of the new hospital building.
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