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Fiberglass Curing Question

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  • Fiberglass Curing Question

    Right now the temperature around here is anywhere from 75 - 85 degrees during the daytime, it was a bit humid today and yesterday. When I mix my fiberglass and hardener I usually have about 2-3 mins of work time which is more than fine and on a hot day it will usually be completely dry within the hour, sometimes 2.

    My question is right now the temperature is a little lower than it used to be, and im using a heater to keep the drying between 1-2 hours. Up to how many layers can I apply in one day? If I start early in the morning say around 8 am and it takes two hours to fully harden that means it won't be tacky, can I put on 5-6 layers in one day?
    1999 Lexus GS300- (going VIP)
    1993 Lexus SC300-Turbo (Totaled by idiot driver)
    1996 Lexus SC400- (Totaled by brother)
    1972 Datsun 240Z- (WIP)
    1994 Toyota Camry- (sold)

  • #2
    Remember, if you apply too much at once you'll get a LOT of shrink and possibly deformation. Resin is thermochemically reactive.

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    • #3
      Ohhh ok that makes sense. Wouldn't want that to happen. What I did was for the first 3 layers I let each layer sit for 24 hours. I figured after 3 layers it would be sturdy enough and I could add one layer every 2 hours instead of 1 layer per day.

      I'd let those 3 layers sit for 24 hours, add one or two coats of bondoglass and that would be my base for the sub enclosure.

      I didn't know it could warp even after drying fully...
      1999 Lexus GS300- (going VIP)
      1993 Lexus SC300-Turbo (Totaled by idiot driver)
      1996 Lexus SC400- (Totaled by brother)
      1972 Datsun 240Z- (WIP)
      1994 Toyota Camry- (sold)

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      • #4
        On the back of the bondo brand resin I use it has mixing ratios and time to cure at different temperatures.. Personally I only use the 1L containers .. measure out 250ml in a cup, then pour in 1/4 of the hardener for 1L. Seems to set up in the same time frame, except when its boiling hot out.. Yesterday it being 102F here, my resin was setting up in about 15 minutes to dry and hard..

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