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For Fin & Leash Plug Installation

Enhance and strengthen your surfboard repairs, fin installations and leash plugs with our Fibreglass Powder. Designed to improve finishing characteristics for a smoother surface, these fibres are perfect for reinforcing castings and creating a durable outer coating when blended with resins. Ideal for general surfboard repairs, they ensure robust and long-lasting results. Compatible with Polyester, Vinylester, and Epoxy resins, our Fibreglass Powder provides versatile and reliable reinforcement for all your repair needs.


  • Clean the area thoroughly with fresh water and let it dry completely.
    Sand the surface with medium-grit sandpaper (e.g., 80-120 grit) to create a rough texture. This enhances the adhesion of the resin mixture.
  • 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.
    Choose the appropriate resin for your application (Polyester, Vinylester, or Epoxy).
  • Measure the required amount of resin according to the manufacturer's instructions. Mix the resin thoroughly in a clean container. If using a two-part resin system, combine the resin and hardener in the recommended ratio.
  • Gradually add Fibreglass powder to the mixed resin. Start with a small amount and stir continuously. Continue adding Fibreglass Powder until you reach the desired consistency. The mixture should be thick enough to stay in place but still workable. Typically, a ratio of 10-20% by weight of milled fibreglass to resin is effective.
  • Use a spatula or putty knife to apply the mixture to the prepared surface. For small to medium repairs, apply in layers to build up strength. Press the mixture firmly into cracks, gaps, or damaged areas to ensure complete coverage and adhesion.
  • Smooth the surface with the tool to minimize sanding later. Use a release film or plastic wrap to achieve a smoother finish and to prevent air bubbles.
    Let the repair cure according to the resin manufacturer’s guidelines. 
  • Sand the cured repair area with progressively finer grit sandpaper (e.g., start with 120 grit and move up to 400 grit) to blend it with the surrounding surface.
  • Clean the area again to remove any sanding dust and prepare it for painting.

Store the Fibreglass Powder 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.