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A silicone free mastic designed for filling gaps between parquet blocks, around skirting boards and door thresholds. Based on a polyacrylate compound the material can be sanded and overcoated with floor finishes. It contains no solvents, is odourless, can be used on all parquet finishes and retains a high degree of flexibility.

  • Expansion: approximately 7 %.
  • High degree of flexibility.
  • Can be sanded and overcoated.
  • Solvent and silicone free.
  • Available in 14 colours.

Standard product features


  • Drying time: 18–24 hours.
  • Coverage per tube: 6 metres.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-75/330 Oil based mastic joint sealants

Product specification

An important note about specifying



Bona Limited


+44 (0)1908 525150

Product reference

Gap Master


[Ash/ Fir]
[Beech dark]
[Beech light]
[Oak dark]
[Oak light]
[Red exotic]

Manufacturer details

6 Thornton Chase,
Linford Wood,
Milton Keynes,
Buckinghamshire, MK14 6FD
Tel +44 (0)1908 525150
Fax +44 (0)1908 311677
NBS Plus