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Thread: New to fiberglassing

  1. #1
    Newbie
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    Jun 2007
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    New to fiberglassing

    Hi all,

    I am new to fiberglassing. I have building MDF boxes since I was 17. I am trying to find a good price on resin. Lowes was $32 and checkers was $28. My thing is I have been calling marine shops and say they do not sell, despite the fact I am telling them it is for boat repair. (Long story). Anyways I saw a build by Naamanf on his Tahoe, and noticed he lived in Denver. If anyone knows of a place in Denver (I love in Arvada, I-76 and Sheridan) please let me know.

    Thanks,

    -Josh

    Current:
    1999 CRV EX
    Old:
    1995 GL
    1999 SHO

  2. #2
    Variable Bitrate
    Join Date
    Feb 2006
    Location
    Vancouver, BC
    Posts
    369
    that price sounds about right for a gallon of resin. You can pick everything you need up at Home Depot or Lowes. I wouldn't sweat the $5 difference. Read up on the internet. Plenty of How-to's and some good information in the Fabrication message board.

  3. #3
    Newbie
    Join Date
    Jun 2007
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    4
    I read a really good thread here, now I am in the planning phase. I picked up all my supplies. My goal is to get the tub done by Wednesday of next week and then finalize how I am going to do the top.

    I ended up getting 2 gallons of Bondo resin @ $29 each and then 2 packs of 9sqft mat for $6 each.

    I think I should have more than enough to do the tub.

    My one question is I have heard of people using any where from 5 to 7+ layers, I am curious if 5 is enough and people are just going overboard?

    Thanks,

    -Josh

  4. #4
    Variable Bitrate
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    Feb 2006
    Location
    Vancouver, BC
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    you're building a glass box for a sub? The more layers the better to reduce the vibrations of the box. MDF is typically used cuz of it's resistance to revirbiration. I think the rule of thumb is that if you can stand on your glass box without it breaking or flexing, it's at a good strength and thickness.

  5. #5
    Newbie
    Join Date
    Jun 2007
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    4
    I am using fiberglass in order to have the shallowest mounting as possible, I am putting the box in my sparetire well and if I give the back of my subs 1.5"-2" of clearance I should be able to mount them low enough that when I throw the carpet back over them you'd never know they were there.

    Ill take some pictures as I go. For the moment I am trying to figure out how to glass in a part of the tub that looks like a bracket ']'. Ill take a picture when I have some free time.
    -Josh

    Current:
    99 Crv EX

    Old:
    99 SHO
    95 Taurus GL

  6. #6
    Newbie
    Join Date
    Jun 2007
    Posts
    4
    I have finally made time to start my project. My one question is about curing. If the fiberglass is still not hard after 24hrs, is there any way I can prevent having to start over? I brushed on a little of the hardener but that had a minimal impact, if any. A buddy suggested throwing down another layer and when that hardens I'll be good. Ideas?
    -Josh

    Current:
    99 Crv EX

    Old:
    99 SHO
    95 Taurus GL

  7. #7
    Maximum Bitrate sporty_drew's Avatar
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    Mar 2006
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    Iowa
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    Have you been to http://www.fiberglassforums.com? It is by far the best site for all your fiberglassing.
    1998 Camaro Worklog Starting over, New setup for 2010

  8. #8
    Low Bitrate Super_dave's Avatar
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    Quote Originally Posted by Jsilv1 View Post
    I have finally made time to start my project. My one question is about curing. If the fiberglass is still not hard after 24hrs, is there any way I can prevent having to start over? I brushed on a little of the hardener but that had a minimal impact, if any. A buddy suggested throwing down another layer and when that hardens I'll be good. Ideas?
    Did you mix the hardener in with the resin ? , it should have harded in a couple of minutes

  9. #9
    Variable Bitrate
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    Oct 2004
    Location
    Sydney, Australia
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    Fiberglass International sell 5 gal tubs of polyester with catalyst for around $100. I get all my stuff from them, you will have to find a local dealer and they deliver.
    Continued Worklog... Upgrades in progress:
    *15.4" WXGA LED backlight touchscreen upgrade
    *Custom fiberglass dash bezel

  10. #10
    Variable Bitrate
    Join Date
    Oct 2004
    Location
    Sydney, Australia
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    Quote Originally Posted by Jsilv1 View Post
    I have finally made time to start my project. My one question is about curing. If the fiberglass is still not hard after 24hrs, is there any way I can prevent having to start over? I brushed on a little of the hardener but that had a minimal impact, if any. A buddy suggested throwing down another layer and when that hardens I'll be good. Ideas?
    You must mix the catalyst with the resin before you apply it and it must be mixed in well, spend a good 30-60 seconds on just mixing it. Mix catalyst at the correct amount, its done by weight not volume so get urself some cheap scales. Dont estimate the catalyst amount, you will almost always be way off, its a very small amount you need, approx 1-3% depending on temperature. Use a syringe to add catalyst. In metric measurements, temperature is 20-30deg use 1.5-2% catalyst. If the fiberglass is warm to the touch or start popping or smoking then you have mixed way to much catalyst, with the correct amount the resin should change colour slowly over a period of about 10-15 workable minutes. It will take around an hour to go hard, and about 24 hours to fully cure. Try and do all the layers within that 1 hour harden time, if you cant give it a rough sand before you put more on.

    You cant paste the catalyst on after if its not hardened and I dont recommend overlaying it with another layer. Just restart the job and do it right this time.

    Hope ive helped you out here.
    Continued Worklog... Upgrades in progress:
    *15.4" WXGA LED backlight touchscreen upgrade
    *Custom fiberglass dash bezel

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