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NBS Source


  • Suitable for use over raised access panels and substrates with well bonded, waterproof residues of adhesives prior to the direct application of STOPGAP1200 PRO.
  • Can be applied to flooring grade wooden substrates such as plywood, orientated strand board (OSB 3), particle board (chipboard) conforming to BS EN 312 Annex A P4-P7 and medium density fibreboard, prior to the application of STOPGAP 700 SUPERFLEX.


STOPGAP FILL AND PRIME is a two-component, fast drying flexible cement based primer. STOPGAP FILL AND PRIME has been designed to have a thixotropic consistency which enables joints up to 4 mm wide to be filled in raised access panels. Applied up to a thickness of 1 mm, STOPGAP FILL AND PRIME sets rapidly and is ready to receive foot traffic in as little as 60 minutes. Once cured, the flexible nature of the product will accommodate movement within the substrate. STOPGAP FILL AND PRIME may also be used to smooth out uneven tongue and groove floorboards prior to over boarding with plywood.

STOPGAP FILL AND PRIME offers exceptional adhesion to a wide range of others ub floor types including STOPGAP waterproof surface membranes, sand/cement screed, concrete, sound asphalt, granolithic, terrazzo, epoxy and polyurethane resins, ceramic and quarry tiles.

General information






Pr_35_31_66_30 Floor covering primersPrimary


K41/110 Raised access floor

K41/120 Raised access floor

K41/130 Raised access floor

K41/390 Sundry accessories

M10/157 Proprietary surfacing to lightweight aggregate levelling screeds M10/

M40/460 Smoothing underlayment

M41/110 Terrazzo tiling

M41/120 In situ terrazzo

M41/130 Precast terrazzo

M42/10 Wood flooring

M42/110 Wood block flooring

M42/120 Mosaic parquet panel flooring

M42/150 Composition block flooring

M42/20 Composition block flooring

M50/110 Resilient floor tiling

M50/45 Existing floor covering removed

M50/460 Smoothing/ levelling underlayment compound

M51/110 Carpeting

M51/150 Carpeting for stairs

Specification data - Floor covering primers

Working time

10–15 minutes at 20°C.

Setting time

60 minutes at 20°C.

Consumption (per layer applied)

0.95kg/m² per mm thickness.

Curing time

Ready to receive further treatments: 60–120 minutes.