The Surfboard Studio - Q-Cel - Inorganic Microspheres

Q-Cel filler is lightweight, preserving surfboard performance and balance. It sands easily for smooth, seamless repairs, ensuring a professional finish. Once cured, Q-Cel forms a durable bond, resistant to water, UV rays, and physical stress, maintaining the surfboards integrity and longevity in harsh marine environments.


  • Clean the area thoroughly with fresh water and let it dry completely.
    Use a sanding block or a grinder to remove any loose or damaged material around the repair area. Sand down to the fibreglass layer to ensure a solid base for the repair.
  • Wipe the sanded area with a clean cloth and some acetone to remove dust, grease, and any contaminants. Allow the area to dry before proceeding.
    In a clean mixing container, combine polyester or epoxy resin with the Q-Cel filler. Add Q-Cel gradually to the resin until you achieve a thick, pasty consistency that is easy to spread but not runny.
  • Add the appropriate amount of hardener or catalyst to the Q-Cel and resin mixture according to the resin manufacturers instructions. Mix thoroughly to ensure the hardener is evenly distributed.
  • Apply the Q-Cel mixture to the damaged area. Fill the repair area completely, slightly overfilling to allow for sanding down to a smooth finish.
    While the mixture is still workable, shape it as closely as possible to the original contours of the surfboard. 
  • Let the Q-Cel mixture cure completely. Curing times will vary based on the type of resin used and ambient temperature. 
  • Once fully cured, sand the repair area with medium-grit sandpaper (around 80-120 grit) to remove excess material. Follow with finer sandpaper (220-320 grit) to achieve a smooth, flush finish with the surrounding surface.
  • For a professional finish, apply a thin layer of resin over the sanded repair area to seal it. Optionally, polish the area for a glossy finish.

Store the Q-Cel in an airtight container in a cool, dry place away from direct sunlight and extreme temperatures.

Q-Cel filler is a fine powder that can be hazardous if inhaled. Wear a dust mask, gloves, and safety goggles. Avoid direct contact with skin and eyes, which could cause irritation. Product is not meant to be ingested or used internally in any capacity. Keep Out Of Reach Of Children.