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Thread: Fibreglass filler with insufficient hardener?

  1. #1
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    Fibreglass filler with insufficient hardener?

    Hi all,

    I have been using fibreglass filler for doing up my screen, and I haven't used enough of the hardener in the mix (Mix requires 50:1, thats not easy to measure up correctly!).

    It has taken about a day and a half so far, and its still tacky, although I can see it hardening.

    Is it going to fully harden still, even though there wasn't enough hardener? Do I just need to wait longer?

    Also, will this affect the end result, ie, will it be weaker because of the longer cure time, or will it work differently?

    Just wondering whether or not I am looking at having to pull it off and start again, but use a lot more hardener

  2. #2
    VENDOR - Nexations Creations Nexson's Avatar
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    Scrap it off and get the remains off with paint/laquer thinner.Your going to have to add more hardener next time. Try to make a circle shape with your filler on your mixing pad and then run a bead of hardener from left to right of that circle.
    Brian @Nexations Creations

    Specialist in Custom Interior Fiberglass OEM Replication Work.

    AIM: Exus28
    E-Mail: [email protected]

  3. #3
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    So the stuff that is on there isnt going to harden fully at all? Damn...

    Ok, will start scraping it all off tonight! Thanks Brian.

  4. #4
    Variable Bitrate djvillar's Avatar
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    yeah, it'll never harden. If the proper amount of hardener is not giving you enough work time, you can mix some MEK or acetone into the fiberglass resin (mix it well) then add the proper amount of hardener. You can even put in a little more hardener then needed cause the MEK will slow the process a little.

    But also remember with fiberglass resin, you're not trying to get the shape perfect. Puts lots of hardener in there slap a bunch on there fast. Then use some heavy sand paper/file, like 40 grit and chop that stuff up to the shape you want and smooth progressively with finer paper.

    Don't be too meticulous with getting that stuff on.

  5. #5
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    Thanks guys, it felt like it had hardened up underneath, but you were right, as soon as i pushed into it with a screwdriver, the whole lot came away like chewing gum

    Mixed up a fresh batch with more hardener, and slapped it on quick smart, and it hardened in about 5 minutes....just as I was finishing putting it on!

    Can't believe I lost 4 days all up with waiting for the old stuff to harden, as I got a full coat on, trimmed and rough sanded it, then got another skim coat on as well.

    Thanks all!!!

  6. #6
    VENDOR - Nexations Creations Nexson's Avatar
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    Amazing how it will not harden in four days but in 5 minutes (with the correct amount of hardener) it will
    Brian @Nexations Creations

    Specialist in Custom Interior Fiberglass OEM Replication Work.

    AIM: Exus28
    E-Mail: [email protected]

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