Asked by: Faouzi Friedmann
asked in category: General Last Updated: 23rd April, 2020

How long does it take for Fibreglass resin to dry?

Once catalysed the resin gradually cures, taking on a jelly-like consistency in about 10-20 minutes before becoming hard in about 30-40 minutes at room temperature (about 20ºC). The curing process generates heat within the resin.

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Furthermore, how long does it take fiberglass resin to dry?

It should take no more than 2 hours to cure with a 10-12 drops per oz resin, at around 80 deg.

Similarly, how long does polyester resin take to fully cure? During the curing process, the catalyzed resin goes through a series of stages from a liquid to a 'soft gel' in about 15 to 20 minutes, a 'firm gel' in 20- 30 minutes and finally to a 'click-hard' (cured) stage in 1 to 24 hours.

Then, what do you do when fiberglass resin won't Harden?

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  1. Set the fiberglass in the sun. The curing of fiberglass resin is an exothermic reaction, meaning that heat makes it work.
  2. Use a heat gun on the fiberglass. If the heat of the sun isn't enough, a more intense heat source may be needed.
  3. Spray a mist of catalyst onto the fiberglass with a spray bottle.

Why is my fiberglass still tacky?

Sticky resin is typically caused by inaccurate measuring or under mixing. The three most common sticky issues are: Liquid, runny resin: causes can include not following the correct 1:1 ratio of resin and hardener, or by adding too much colorant. The liquid resin will need to be scraped off before you pour a fresh coat.

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