Basic fibre glass question
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  1. #1
    Official RnS Addict 29stude's Avatar
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    Basic fibre glass question

    Probably a daft question as Iíve never used this before.

    Instructions say to measure resin by weight, but can I do this by volume? Ie using paint measuring cups?

    Or do I actually need to weigh it before adding the catalyst?

    Thanks

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    only need 3-5% hardener in it
    at least dick turpin had the decency to wear a mask!

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    Official RnS Addict Big Joe's Avatar
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    Quote Originally Posted by 29stude View Post
    Probably a daft question as Iíve never used this before.

    Instructions say to measure resin by weight, but can I do this by volume? Ie using paint measuring cups?

    Or do I actually need to weigh it before adding the catalyst?

    Thanks
    A lot depends on the quantities involved but I use small digital scales (I got mine from Maplins) and mix it in those foil food containers.
    First read the instructions to get the right resin/hardener mix
    Weigh the container first (then you can zero the scales, pour rhe resin then do the sums to get the required amount of hadener and add that.
    Simples....
    You can do it by quantity but because the stuff is so thick and sticks to the measuring cup it's not as accurate. Some resin suppliers suply pumps that pump out the correct amounts and all you have to do is count the pumps

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    Official RnS Addict 29stude's Avatar
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    Quote Originally Posted by Big Joe View Post
    A lot depends on the quantities involved but I use small digital scales (I got mine from Maplins) and mix it in those foil food containers.
    First read the instructions to get the right resin/hardener mix
    Weigh the container first (then you can zero the scales, pour rhe resin then do the sums to get the required amount of hadener and add that.
    Simples....
    You can do it by quantity but because the stuff is so thick and sticks to the measuring cup it's not as accurate. Some resin suppliers suply pumps that pump out the correct amounts and all you have to do is count the pumps

    Ah, that clarifies exactly why you weigh it.
    Thanks for info, I’ll get myself a set of scales today.

    Cheers

  7. #5
    Rods 'n' Sods Junkie DEVONMAN's Avatar
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    I use the disposable spray paint cups with the scale up the side to measure the resin and the the catalyst comes in a container which is marked to aid dispensing whatever percentage you want to suit the resin volume you are using. 2-3 % has worked ok for me 20 degrees C (at room temp.)

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    See, I told you I was sic ColinHD's Avatar
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    I use cut down 2lt plastic milk bottles, as they are all about the same size, I weighed the first few batches and made a little measuring stick.

    Use the same measuring stick for all new bottles, did a couple of random checks and works well.

    Throw the bottle out after a couple of mixes.
    " Big Mess - I'll get back to you"

    Ed Roth - "I couldn't get enough of his stuff, cos he understood!" - 28Chevy

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    Official RnS Addict 29stude's Avatar
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    Thanks for your advice chaps.

    First attempt went ok. Just got to work out how to stop those stray fibres sticking up and how not to turn it to mush.
    Secret seems to be fiddling with the layers as little as possible.

  10. #8
    See, I told you I was sic ColinHD's Avatar
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    Have you got some rollers to flatten down and wet-out ?
    I made these out of mini paint rollers & washers.
    https://www.rodsnsods.co.uk/forum/ga...-538089/page10
    " Big Mess - I'll get back to you"

    Ed Roth - "I couldn't get enough of his stuff, cos he understood!" - 28Chevy

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    Rods 'n' Sods Junkie Paul L's Avatar
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    I'm another fan of the cut down milk cartons used for resin mixing.

    I simply pre-marked levels on the outside at 50ml intervals using water.
    ( The water was completely gone/dry before I started mixing. )



    But I found the plastic syringe the easiest way to measure the catalyst.

    When wearing gloves, just cover the 'pointy' end with your finger and fill up the tube.

    Then add the plunger and squirt into the milk carton.

    Hope that helps, cheers, Paul.

    PS
    The good news is the more fibreglass work you do, the easier it gets to judge things.

  12. #10
    See, I told you I was sic ColinHD's Avatar
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    I cut the cartons so you keep the handle, much easier to hold.
    " Big Mess - I'll get back to you"

    Ed Roth - "I couldn't get enough of his stuff, cos he understood!" - 28Chevy

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