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Thread: what type of fiberglass do you use?

  1. #1
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    what type of fiberglass do you use?

    I have a 50 yard roll of 5.53 oz/yrd fabric I will be using, I don't want to use fiberglass matt... I know I will need a few layers of it to get any decent strength, but it should be good for making light interior parts. Just want to know what type of fiberglass do you people use for interior parts, and why?

  2. #2
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    also, I want to know if the fiberglass I have is good for making molds, or will I need heavier cloth? Eventually I want to make a mold of my hood and doors, on the RS.

  3. #3
    Variable Bitrate SickVette's Avatar
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    I use a non waxed polyester or vinyl ester resin depending on the job. I purchase from fiberglass supplier. Mostly they sell to boat builders. I would guess in NY you should have supplu shops like that also. Home Depot and some auto parts shops sell resin also. Only problem with that is the shelf life. Resin has a 90 day shelf life. It is still usable after those 90 days but drying times and shrinkage will be altered.

    With that light of a cloth yes you will need a few layers. Try to get an unwaxed resin. If you get a waxed you will need to sand between every hardened layer.

  4. #4
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    Have to checked if its waxed. Is it normal for fiberglass to be waxed? I've never heard of that.

    edit: nevermind. im an idiot.. i thought you meant the cloth would need to be unwaxed...

  5. #5
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    what do you use for mold seperation? I'm thinking of using plastic wrap, will that work ok?

  6. #6
    Variable Bitrate SickVette's Avatar
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    I use a few different things depending on the mold. I would be careful with plastic wrap because it might melt....I am not sure. You could always test it on something that can be ruined if it does not work. I use blue masking tape,aluminum foil, and sometimes a garbage bag. But I also Pam as a mold release on small projects. On big stuff I use actuall mold release wax.

  7. #7
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    Quote Originally Posted by SickVette
    I use a few different things depending on the mold. I would be careful with plastic wrap because it might melt....I am not sure. You could always test it on something that can be ruined if it does not work. I use blue masking tape,aluminum foil, and sometimes a garbage bag. But I also Pam as a mold release on small projects. On big stuff I use actuall mold release wax.
    the plastic wrap thing has been done, i just don't remember what resin was used. i think polyester resin will melt it. i'm not sure though. Aluminum foil is not a bad idea. The garbage bag probably only works good on flat surfaces. What I should be asking, is what do you use on the plug, not the mold, the mold is pretty obvious mold release wax will work fine on it, but for the plug that has no coating on it, like say if it's made of styrofoam or something, what would you use?

  8. #8
    Variable Bitrate SickVette's Avatar
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    My bad....I was talking about pulling a mold from something like the cars wheel well or kickpanel. I do not pull many molds from anything else. If you have an actuall part to use as a plug I would use a mold release wax. Several coats of it according to the directions.

    If you decide you want to paint the finished part prime the negative before doing your layup. Actually wax it then prime it and then lay up. When you pull the finished part it will have a perfect primed surface ready for paint...provide your negative is perfect.

  9. #9
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    Quote Originally Posted by c a m a r o
    like say if it's made of styrofoam or something, what would you use?
    I would use 3M spray adhesive and stick sheets of foil to it. Then spray with some wax.

  10. #10
    Maximum Bitrate Snootch's Avatar
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    Go to a marine supply store and buy fiberglass resin:

    http://www.boatersworld.com/webapp/w...uctId=13006249

    there, you can get it by the gallon, and also fiberglass matt and cloth. For mold seperation, I recommend buying PVA:

    http://www.boatersworld.com/webapp/w...oductId=718809

    and putting some in a spray bottle. The PVA can be found at most marine supply places as well.
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