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Thread: Fiberglassing Tips?

  1. #111
    Constant Bitrate 98EXL's Avatar
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    Quote Originally Posted by Kayon View Post
    First of all, never use Fleece, only Spandex. You should also never use staples and use CA glue and Activator (Can be ordered online from Tower Hobbies.) Fleece when hard is very brittle and anyone who's made a center console or a sub enclosure and tells you their enclosure dosen't have cracks or dosen't flex, or that thier console dosen't have cracks is straight up full of ****.

    Cheap **** from Home Depot is a no-no. You should also, while applying use the heaviest Oz glass first, which logically would be 7 oz, then lighter and so on and so forth.


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  2. #112
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    I have a question for you guys.

    Lets say you need to build a 2 cu ft enclosure for a pair of 12's. These will be powerful mosters and need a really stiff enclosure.

    I can make a square box entirely from 3/4" MDF or make the top and sides from fiberglass to get cool shapes. Once the fiberglass is thick enough to be equivalent to the MDF which would weigh less?
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  3. #113
    Constant Bitrate 98EXL's Avatar
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    Quote Originally Posted by JasonWW View Post
    I have a question for you guys.

    Lets say you need to build a 2 cu ft enclosure for a pair of 12's. These will be powerful mosters and need a really stiff enclosure.

    I can make a square box entirely from 3/4" MDF or make the top and sides from fiberglass to get cool shapes. Once the fiberglass is thick enough to be equivalent to the MDF which would weigh less?

    the fiberglass.....it doesn't need to be *** thick as the MDF either, and will still be just as strong, and way lighter
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  4. #114
    FLAC
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    I was thinking 1/4 fiberglass weighed about the same as 3/4 MDF. There's a big difference in density. You think the fiberglass is lighter?
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  5. #115
    Constant Bitrate 98EXL's Avatar
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    Quote Originally Posted by JasonWW View Post
    I was thinking 1/4 fiberglass weighed about the same as 3/4 MDF. There's a big difference in density. You think the fiberglass is lighter?
    fiberglass weighs nothing....resin does

    and yes, alltogether, it's lighter

    http://www.bwimports.org/forums/showthread.php?t=1413

    that's in my trunk....the top MDF sheet weighs so much more than anything else
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  6. #116
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    Spandex, because it is thin it absorbs the resin quickly, unlike that of fleece. This in itself (aside from the fact that fleece stretches no where near as capable as spandex) is why spandex is the preferred fabric. Spandex, also is 75% neoprene and 25% cotton. Unlike T-Shirt material which is 99% cotton. Cotton, is suseptible to heat. We all know this if you have shrunk a shirt in the dryer. The thing to remember here is Resin is a polyester base material. You know its a polyester base material because the hardner is in drop form rather than 1:1 ratio form like epoxy. When resin cures, it generates heat. Whether you feel the heat or not, trust me, its there. This heat, cause cotton to shrink. If resin is used with T-Shirt, the heat generated will shrink the cotton and result in warping of this base layer. Because the hardened stretch fabric is the base of all the consecutive layers of fiberglass, consequently, all your layers of fiberglass will also be warped. Unless you pinch the fabric prior to glassing. And the only way to do that is to 1st identify the fact that you have a warp, and 2nd, drive a screw though the fabric into the below wood skeleton. This pulls the fabric down and reduces the warp but does not eliminate it. This technique is known as pinching. How do you reduce: excessive use of resin, reduce warping, reduce the need for pinching, reduce the need for excessive bondo shaping after fiberglass? 1st thing is first, don't use fleece or T-shirt. Always use spandex.

    To attach the spandex to the skeleton is really simple. However, I strongly suggest you apply it in 5" incriments so you can work with the material better. CA glue is basically a super glue. However, you also need somethng called Kicker. Kicker is an activator for the CA glue.
    Example. CA glue cures in roughly a minute. CA glue with Kicker sprayed on, cures in roughly 3 seconds. I really am not kidding about the 3 seconds.

  7. #117
    Phillie Escalade182's Avatar
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    okay so lets say I'm getting a chop gun soon for a 5.5cfm, 60g compressor...

    whats the deal with them? everything at once? perfect layer? just the idea on spitting out chunks of resin-strandmat doesnt produce (in my mind) an (almost) perfect finish...

  8. #118
    Phillie Escalade182's Avatar
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    nor the thought of shooting chunks on resin-strandmat at 120 psi at a hardened peice of spandex... I have a feeling that might blow right through it.

  9. #119
    Newbie Nskforlife's Avatar
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    buy your products here.

    i'm looking into making custom subs out of fiberglass also. la de da de da... you know how it goes. so i went to hifibuys down the street and asked them what they used to do glass their porsche. check it out here http://www.hifibuysnashville.com/mobile.php

    they told me to go so www.selectproducts.com and get the glass and resin and mold cloth and rings there. they told me this cause they said that resin is supposed to be flipped upside down every 30 days or it will seditate at the bottom. and their mold cloth is Really thick and strectchable. so if you wanna save yourself some aches and pains, get the speaker rings, mold cloth, and resin n hardener there. they specialize in it unlike home depot who doesn't even know where fiberslass is located at in the store.

    i'm also looking for a review on the 12volt resource.com's resource cd and is it really worth it. thanks.

  10. #120
    Maximum Bitrate Naamanf's Avatar
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    Quote Originally Posted by Escalade182 View Post
    nor the thought of shooting chunks on resin-strandmat at 120 psi at a hardened peice of spandex... I have a feeling that might blow right through it.
    If your doing mold work it's the way to go.
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