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Thread: Mistakes with fibreglass

  1. #11
    Low Bitrate AJ3000's Avatar
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    sorry should have been more clear - its a 1000w peak, 500w RMS as far as i am aware - its an Audiobahn AWC12T running through a stealth 500w amp. bought them as a package so i think its all good! the 1st shot i had at this i put in 2 layers, and could jump on it without it breaking, and that had heaps of air bubbles in it! as i said before, the actual making of it seems easy enough, its just making sure its gonna last more than 30 seconds when its done!

    thanks man

    AJ
    East Coast Audio UK

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  2. #12
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    Quote Originally Posted by AJ3000 View Post
    ARGH! new question now! - i really need to know how many layers of 650 mat i need to put in for my negative before i can pop it out of the trunk of my car without warping, and how many it is gonna need to be strong enough to support the vibes from my 500w sub. also any advice on powercaps would be majorly appreciated, as i kinda know i need one, but don't really understand why.

    the greatest irony is that the fabrication is the easiest bit! its just making sure i dont mess it up aloong the way! great forum by the way people - more info that the rainman with an encyclopedia...

    until the next time

    AJ
    650g mating is a very heavy grade, this would be the reason for the bubbles. 650 is for boat hulls not wooferboxes, its harder to wet out smooth. Get yourself a metallic roller, they are a godsend. I would recommend a much lighter matting on your next purchase, 100-300g is plenty for automotive. You will only need 2-3 layers of 650 to keep its shape.

    For further layers of the 650 try splitting it up. 650 will be made up of many smaller grades, you can peel it back to form two 325 sheets, you will find it easier to apply it.
    Continued Worklog... Upgrades in progress:
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  3. #13
    Low Bitrate AJ3000's Avatar
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    BiGGy you are a genius! i noticed the layering when i was layering it out. i got me a paddle roller, and you're right they do rock something chronic. i got 650 matting as i live by the sea, and we have a lot of boat shops but not much else! if 2 layes is enough to keep shape, will it be enough to not blow up when i put the sub in? or should i whack another on or 2 on just to be sure?

    nice one

    AJ
    East Coast Audio UK

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  4. #14
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    Yeah I would thicken it up allot after you get the whole enclosure together. I would put 6 or more 650 layers total to finish it. When using heavy matting on curves scrunch it up like a newspaper and rough it up a bit, it loosens up the strands and makes it even easier to apply. If you have any other fb questions you can pm me.
    Continued Worklog... Upgrades in progress:
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    *Custom fiberglass dash bezel

  5. #15
    Low Bitrate AJ3000's Avatar
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    ok so i'll slam some pics and some descriptions if need be. i have also put in pics of my false floor amp install to see what you all think of that. its the original boot carpet used, which will be the same as what i cover the sub boxes in.

    ok so in order - 2 pics of one of my 2 stealth amps flushed into the false floor

    next pic is my masking ready to glass - there is 2 layers of tape criss crossed, (1st top to bottom, second side to side) and there uis a layer of tin foil below just in case.

    ok now the glassing. we come in here at the 3rd layer of 650 grade matting. pics below are some close ups of some of the bubbles that i have. they are in the tightest crevice in the corner of the car, and acually are about 85% glass, with only a bit of bubble in it. i guess i'll sand it out and kitty-hair it to make it strong though?

    I think it is going ok so far. more pics to follow.

    cheers dudes and dudettes

    AJ
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    East Coast Audio UK

    Daewoo Lanos "Woo of Doom" Show Car

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  6. #16
    Newbie maxgtr2000's Avatar
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    Fiberglass is weakest in flat areas. You can save time by making as many flat areas as you can out of wood, like the floor of your mold for example could have been a small piece of 3/4" mdf. But looking good so far.

  7. #17
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    Looks pretty good, remember to go past your mark so you can trim back to get the right capacity and shape you want. I would have foiled the other side instead, but thats just my personal preference, nothing wrong with what you did there... Its harder to glass onto foil initially but very easy to pop out the boot and the foil peels off the fiberglass very easy to so you dont have to sand all the tape off. Wouldnt worry about those bubbles, just sand them back before the next layer. It looks great.
    Continued Worklog... Upgrades in progress:
    *15.4" WXGA LED backlight touchscreen upgrade
    *Custom fiberglass dash bezel

  8. #18
    Low Bitrate AJ3000's Avatar
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    i think the biggest hurdle i'm gonna come up against is volume for the subs..... the boot on this car is TINY and i dont think i'll be able to get the full capacity for a pair of 12" subs to punch properly. it doesn't worry me too much, as i dont to be drowned in bass, just a complimentary thump where it is needed.... as a result the enclosures are going to be quite small. its also why i am mountint the subs reverse, to get a little bit more space in the enclosure. oh well i'll just have to see what happens with this one.

    what worries me is that this is the bigger side of a very lop-sided boot. the install on the right is going to be tiny, almost aesthetic only!

    well its getting there, more to come over the next few days amigos

    AJ
    East Coast Audio UK

    Daewoo Lanos "Woo of Doom" Show Car

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  9. #19
    Low Bitrate AJ3000's Avatar
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    oh by the way i put the foil down first cos my car has that horrible korean shiny plastic thing going on in the boot, and as a result i couldn't get any form of tape to really stick to it. so i foiled first and held it in place with gaffer, and then taped over the top. if i had thought about it more i would have put a second layer of foil on, but i was rushing to beat the rain!
    East Coast Audio UK

    Daewoo Lanos "Woo of Doom" Show Car

    Fabrication 4%
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    Finish Line - not even in sight!
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  10. #20
    Low Bitrate AJ3000's Avatar
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    OK!!! so here we are several weeks later (partly due to losing my crappy job and not having the cheddar to continue!) but i'm back in the game and carrying on where i can

    we come back in with 6 layers of glass down (650g) and i have just finished hacking the knackers out of it with an angle grinder (for the record HOW MUCH FUN?!?!)

    first pic is the rough outline of the negative of the sub - speaker will protrude from there, and it'll be all curvy and lovely when its done!

    second pic is the thickness (its a total tank, anbout 1/2" thick) and for a size guide thats a standard black and decker workmate its resting on.

    so there we are - keep the comments coming, i want this to look cool when its done so all advice appreciated!

    until next time
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    East Coast Audio UK

    Daewoo Lanos "Woo of Doom" Show Car

    Fabrication 4%
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    Finish Line - not even in sight!
    TOTAL SPENT SO FAR 250

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