Sealant

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Defect and Repair

Sealants

 Defect

Repair

Mould/Fungus Growth

Caused by water accumulation (in troughs), blockage (behind bulges) and capillary action (through cracks).

 

The dirt which collects consists of organic materials. i.e. traces of shampoo and soap, skin flakes, fats etc, and offers a rich feeding ground or mould.

 It is usually sufficient to treat the affected area with the special anti-fungus sprays available on the market. These sprays are based on chlorine bleaching solution, a concentrated version of the “Javelle Water”.
 

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Natural Stone

Adhesion failure

The loss of bond between the sealant and substrate

 

 
  • Perform adhesion test initially
  • Apply proper amount of primer
  • Mix 2 Component, sealant completely
  • Do not use tooling aids
  • Use proper solvent such as white spirit on polyester powder paint
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Cohesive & adhesive failure

 

 
  • Use products with proper movement capability
  • Minimize the thickness of sealant
  • Repair by using band-aid joint
  • Use proper bond breakers and backer rods
 masticfailure-nus-fba2-mz-case1 Sealant debounding To take off the affected area and reapply

Backer rod outgassing (Bubbling)

Internal Pressure within the closed cell backer rod is released during backer rod installation due to puncturing. Sealant immediately applied will show bubbles and poor aesthetics.

 
  • Direct the cut surface of the back-up materials towards the inside when installing
  • Use the back-up materials of open cell.

Note: For more defects, please refer to the Defect Library.