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Old 05-03-2016, 12:21 PM
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Default Fiberglass box help

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Ok, so I've jumped into my first fiberglass box....a couple of youtube videos and your an expert right, lol? Ok, so it's not the prettiest, but I did have a couple of quick questions.

1. The box is molded to the actual floor plan, and unfortunately it isn't even from one side of the truck to the next, so it's hard to put a divider in and get it right. Opinions of leaving the sides undivided?

I'm looking at a pair of SD-3 12's, and I've kicked around a pair of HDS210's as well, I'm sitting at about .8 per side, so 1.60 total before sub displacement.

2. Do I need to coat the inside of the box? I've seen here and there that you should rubberize to change the "fiberglass tone", but not sure if that's a wives tale, or legit.

I'll attach some pics, don't judge, it's still pretty ugly. I'll post more when I pick the subs and actually finish out the box. I think I'm going to rhino line the outside, there is only about 1.5" that will even be visible.
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Old 05-03-2016, 12:46 PM
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I would leave out the divider. You may need some vertical bracing though because it looks like the front baffle will have a lot of surface area.

The glass looks like it's got some bubbling in between the layers. A bubble here or there is not a big deal, but if there's a weak spot it will hurt performance. A very easy way to reinforce glass is to mix some long-hair filler with some resin and pour/spread it onto the inside of the enclosure. It works well on corners like where the glass meets the MDF edge as well to build up strength. There's no need to coat the inside of the enclosure for sound reasons, but you might want to coat the outside to protect it and keep potential rattles at bay if the glass doesn't fit perfectly.
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Old 05-03-2016, 01:21 PM
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I learned a lot between the first and the 3-4th layers. I added another layer after taking those shots, and covered all of the bubbled layers again in a much more thorough way. It was far easier working on a table vs. stuffing my giant self in the back seat,lol. I'll take your advice though, and do one more coat with the long hair filler.


For the bracing what would you recommend? Should I glass in a pillar or two, or would one or two 1"x1" pieces from the front to back work?
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Old 05-03-2016, 02:25 PM
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The last brace I made I attached a piece of wooden dowel (you could use a 2x4, a couple pieces of 1x1, or whatever) to the baffle first with a rough cut on the bottom about the length I needed to contact the glass portion. Once I trimmed it down so the baffle sat flat against the lip and the brace was just touching the glass on the bottom, I secured the baffle (with the cutout already done) and reached through the speaker opening with long hair filler to smoosh around where the brace met the glass. That worked really well. A single larger brace in the middle of the enclosure will be plenty and should be easy to reach from the sub cutouts.
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