Bucket Grey 7 kg

Elastic waterproof and airtight coating based on innovative SMP-technology




  • Waterproof & airtight
  • Excellent adhesion on many surfaces (without primer)
  • Can be applied on moist surfaces
  • Weather & UV resistant
  • Chlorine and salt water resistant
  • Self-levelling
  • Non-shrinking
  • Permanently elastic (>250%)
  • Paintable and plasterable
  • Free of bitumen, isocyanates and solvents


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Suitable for:

For sealing, protecting and repairing roofs, walls, cracks, joints, ducts and connections. Excellent adhesion (without primer) on a wide variety of materials, such as concrete, metal, stone, wood, zinc, PVC and EPDM (test in advance). Can be applied on horizontal and vertical surfaces and suitable for indoor and outdoor applications, such as sealing ducts, floor seals, expansions joints, wall-window frame connections and below ground level structures. Also suitable for waterproofing under tiles in wet rooms and swimming pools. Perfect for airtight sealing of the building envelope. Airtightness has been tested according to EN 12114 and EN 1026. Not suitable for PE, PP, PTFE and non-treated Bitumen.

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Before use:

Working conditions

Only use above +5°C.

Surface requirements

SMP-300® can be applied on moist surfaces, however avoid puddles of water. New concrete structures need to dry for at least 28 days.

Preliminary surface treatment

Remove loose cement and dirt with a hand brush and make the surface free of dust and grease.


Brush or paint roller. GRIFFON Geotextile, GRIFFON Wipes


Do not dilute.


Airtight constructions: 1,3 - 1,5 kg/m2 at a layer thickness of 1.0 mm. Waterproof constructions: 2,0 - 2,3 kg/m2 at a layer thickness of 1.5 mm. Coverage can vary according to the roughness of the substrate.

During use:

Directions for use

Before pouring the sealant into the bucket, gently knead the bag to mix the coating. For large surfaces, you can also pour the coating directly onto the surface from the aluminium bag. Apply in 1 (Airtight Constructions) or 2 (Waterproofing) layers. Apply a first layer to the surface by brush or roller. Use GRIFFON GeoTextile for seam, crack and gap-bridging applications. Press the GeoTextile into the wet layer until it is completely saturated with the coating. Apply a second layer SMP-300® within 1 hour (or at least before skin formation occurs) on to the GeoTextile, or after complete curing of the first layer (approximately 6 - 8 hours*). If desired, sprinkle slate chips in the still wet layer to obtain an aesthetic whole of the entire roof. * Coating cures by humidity and moisture in the substrate.


Always ensure a layer thickness of at least 1.5 mm (Waterproofing) and 1.0 mm (Airtight Constructions) after curing (wet=dry). At temperatures between 0°C - 5°C, place the closed aluminum bag in a bucket with warm water beforehand to improve workability. For gaps, connecting joints or seams > 5mm in for example partition walls, first use Griffon HBS-200® Flex Foam or PE joint-filling cords. Can be painted after full curing with both acrylic and alkyd paints. The drying time of alkyd paints maybe extended. Always test in advance. The adhesion of stucco and tile adhesive to the coating can be improved by surface-enhancing quartz primer (Primer for non-absorbent surfaces).

Points of attention

Coating can withstand light rain after 30 minutes and heavy rain after 50 – 60 minutes. Completely waterproof after 12 hours, depending on relative humidity, temperature and surface. Take into account longer curing times at lower temperatures and lower humid weather conditions. Can be applied on bitumen treated with slate. Do not use coating on non treated bitumen roofs as the coating can discolor or detach in time. Always ensure the required minimum layer thickness to be able to provide permanent mechanical resistance. If a joint sealant is used in combination with SMP-300® coating, we strongly recommend to use a neutral silicone or SMP sealant, for example Griffon S-200 or Poly Max® Fix & Seal, to prevent discoloration of the sealant. Not suitable for PE, PP, PTFE and non-treated Bitumen.

After use:


Uncured residues can be cleaned by using GRIFFON Wipes or a solvent-based cleaning agent. Cured residues can only be removed mechanically.

Storage conditions

Properly sealed packages should be stored in a dry, cool location at temperatures between +5 °C and +25 °C. Shelf life: At least 15 months in unopened package. An opened package has a reduced shelf life.

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