Description
Bostik SL C525 Smooth is a moisture tolerant, single part, polymer modified cementitious underlayment for the smoothing and levelling of uneven subfloors.
It is suitable for hand application or by pump application to give an extremely smooth finish.
It can be laid over most common substrates including;
- Concrete subfloors
- Sand/cement screeds
- Stone
- Calcium sulphate-based screeds
- Mastic asphalt
- Firmly bonded unglazed ceramic
- Terrazzo
- Quarry tiles
It is not suitable for use over existing adhesive or water-soluble residues, or low strength smoothing compounds.
Bostik SL C525 Smooth is protein-free, making it suitable for use in biologically sensitive areas.
It is suitable for use with warm water underfloor heating systems, provided a surface temperature of +27°C is not exceeded.
Do not use prior to applying surface DPM’s.
It is not to be used as a wearing surface and should always be covered with a floor covering.
For interior use only.

