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Thread: fiber glass box thickness

  1. #11
    Well, He asked for it. WebDog's Avatar
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    ehh maybe ill get some kitty hair and do a layer on the inside. that would be easier then trying to put a layer on the inside of mat.
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  2. #12
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    Quote Originally Posted by WebDog
    I Think when the sun comes out this weekend ill put a few more layers on just to be sure. Thats not my final bono job i just wanted to get a better looking / smelling product to stick in my car to test, it hits hard i need to fill with poly fill and test again. that was actualy just one layer of bondo.

    So you think i need to remove the bondo? or can i just put a few more layers on top of it?

    I would just rough it up with like a 40 grit before putting another layer on the outside if that's the route you wanted to go. You will have to give the glass and resin something to bond to.

    Or...another and possibly a better option is to go with the kitty hair on the inside. This stuff can be a little tricky how ever. If you don't mix it throughly (as with regular bondo) you will have soft spots, no good. It's somewhat difficult to mix since the strands in kitty hair are so long. Another downfall is that when you go to put it on from the inside you might end up getting air pockets and not know it. That can cause cracking since it's a void.

    I would recomend going with DuraGlass. It's just as good and easier to work with. The strands are a little more fine so it will be easier to mix. It's still EXTREMELY strong once it's kicked. I used about 2 gallons of it on my box, but my box also has about 8 sq. ft. (3' w x 2.5' l) of surface area where I had to put the stuff and I was using it ONLY. No fiberglass mat here. It's fairly expensive and can only be had at an auto body supply store (I paid about $35 a gallon for it). It's completely water proof and extremely strong.....

    just a thought!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

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  3. #13
    Well, He asked for it. WebDog's Avatar
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    ok well I applied 26 OZ of bondo-glass to the out side adding 1/8th to 1/4" all over the box it seems more solid now. I also put a bead of liquid nails on the inside where the fiberglass is meet with the wood...

    Any recommendation for good screws for mounting the sub?
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  4. #14
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    first question: is that ring made of wood or is it just made of the fiberglass/bondo etc?

    I hope it's wood at least under there....otherwise you will run into crack propagation

    if so....a good #10 screw should be fine! just remember to predrill your holes one size smaller than what your screws will be!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  5. #15
    Well, He asked for it. WebDog's Avatar
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    Theirs is a ring of wood. Itís hard to tell because I used metal welding rod to position it before I fibreglassed, I didnít want to lose any volume with big pice of wood holding it up.
    Ill go over to the hardware store and get some cool looking screws, and a drill bit.

    hers a pic of that part with just the wood and metal rods.
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  6. #16
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    cool - I used some security torx on my subs.....looks clean....lol

    did you use particle board for the box? if so I would recomend pouring some resin in it and brushing it around to seal it.....but maybe that's just me...

    =]

    looks good!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  7. #17
    Well, He asked for it. WebDog's Avatar
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    yea particle board 3/4" do you think that would make it any stronger? maybe ill just pour some in lol. the way i mount the box if the back blew out i would have a killer dent in my car haha. I alredy used about 2 tubes of liquid nails.
    1990 Jeep Cherokee
    2000 VW Golf TDI 4dr
    2005 VW GTI MKIV - SOLD

  8. #18
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    curiosity...are u against getting nylon roap and cutting it to fit in the box, soaking it in resin and the glassing it to the inside of the box? it works great for strengthening just like using ribbing in anything else greatly strengthens the structure...
    Kevin

  9. #19
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    not so much for strength, just to help seal it....

    the particle board has a tendency to come apart....as you probably found out while cutting it.....this way you are just more or less sealing it.....

    that's part of the reason people use MDF to make these boxes.....but it's not really a big deal - particle board just isn't as dense as MDF as well...
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  10. #20
    Constant Bitrate kalito's Avatar
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    Quote Originally Posted by Red GTi VR6
    good find Kalito!

    that's an interesting tweeter arangement...why did you end up going with it?
    in my opinion it looks good and it sound better!
    98.8 complete
    95 chevy blazer s10

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