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Fuller Tool Box Invisible Crystal Clear Sealant 300g

Code: 40-TBINV
U.O.M. - Each
Tool Box Invisible is a crystal clear waterproof sealant for transparent joins and bonding applications. It provides a tough, water-resistant seal and adheres to a wide variety of materials. It can be used in interior or exterior applications and cures to form a permanently flexible and elastic bond. It provides invisible glass to glass sealing.


Tool Box Invisible is a crystal clear waterproof sealant for transparent joins and bonding applications. It is ideal for use as a general purpose low-modulus construction sealant where a colourless result is required. Toolbox Invisible skins in around 10-15 minutes and cures 4mm per day at 23°C.

Tool Box Invisible is suitable for Green Building applications requiring VOC of maximum 30g/lt.


  • Solvent and isocynate free; free of phthalate plasticisers
  • Cures to form a permanently flexible and elastic bond
  • Highly flexible (+/- 20% of original joint width)
  • Rapid skinning and curing
  • Invisible after curing
  • Suitable for interior and exterior use with high UV resistance
  • Mould, chemical and heat resistant (to 80°C)
  • Ideal for:

  • External and internal construction
  • Sealing and bonding a wide variety of substrates
  • For transparent, colourless results
  • Sealing gaps in concrete, brick, mortar, metal and stonework
  • Suitable for Green Building applications requiring VOC of maximum 30g/lt.

    Surface Preparation:

    All surfaces must be clean , dry, sound and free from dust, oil, old sealant or other contamination. For best results wipe all surfaces with isopropyl alcohol (IPA), using a lint free cloth. Manufacturers pf plastics should be consulted about suitable cleaning solvents. Adhesion to plastics should be pre-tested if in doubt.


    Cut tip off cartridge, fit nozzle, load into caulking gun and trim nozzle to desired size.

    Adhesive - apply to one surface, press together the components. When used as an adhesive, ensure at least 2mm bond thickness is formed, do not clamp or use excessive force otherwise adhseive will be squeezed out from join. Support until a strong bond is formed.

    Sealant - When used as a sealant, apply Toolbox TM Invisible and within 10 minutes tool off to a smooth finish using a spatula. Toolbox TM Invisible cures by reaction with moisture, so encapsulation between non porous surfaces will delay or suppress cure from occurring.

    Clean Up:

    Clean up uncured adhesive with mineral spirits. Cured material can be removed by trimming with a knife or scraper.


    300g cartridge will give approximately 15 lineal metres of a 5mm bead.

    Additional Information

    Colour Clear
    Suits Substrate Aluminium, Brick, Cement, Concrete, Fibreglass, Glass, Polyurethane / Plastics, Steel, Timber
    U.O.M Each
    Box Quantity 12
    Brand HB Fuller
    Range / Model Tool Box
    Size 300 g
    Min Working Temp -40 degrees Celsius
    Max Working Temp +80 degrees Celsius
    Gel Time / Skin Time 10 - 15 minutes at 23 degrees Celsius
    Cure Time 4mm per day at 23 degrees Celsius
    Modulus 1.92MPa (Modulus of Elasticity DIN 53504 @100%)
    Shore A Hardness ca. 49
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