How to Cure Fiberglass Resin in Cold Areas

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Fiberglass is a material that requires a catalyst to harden. A catalyst needs heat in order to chemically react with the fiberglass and harden up. If you are working in cold conditions, the fiberglass will take a very long time to harden or it won't harden at all. In order to let the fiberglass and catalyst react properly in a cold area, it will need a heat source. This can be anything from an industrial heat gun for small areas or a turbo heater for large areas.

Things You'll Need

  • Respirator
  • Fine grit sandpaper
  • Palm sander
  • Rags
  • Acetone
  • Fiberglass
  • Methyl ethyl ketone peroxide (hardener)
  • Air roller
  • Turbo heater
  • Wearing a respirator, sand the area you are repairing using a palm sander and fine grit sandpaper. Scuff the area thoroughly for the best results.

  • Clean the repair area using a clean rag and acetone. Remove any grease and dust from the repair area. Grease or oil on the surface can cause a poor bond.

  • Lay up the repair area. Make sure to remove all the air bubbles using an air roller. Any air bubbles left in the fiberglass will cause weak spots and possibly need repair again.

  • Place the heat source so it is a couple of feet from the repair. If the heat source gets too close it will cause the fiberglass to burn and will make it brittle. Evenly apply the heat until the fiberglass completely hardens.

  • Sand the repair using fine grit sandpaper and the palm sander to eliminate any burs or hairs that may be present.

Tips & Warnings

  • Wear a respirator when working with fiberglass.

References

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