fiberglassing from the inside

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=24791
Printed Date: May 16, 2025 at 2:11 AM

Topic: fiberglassing from the inside

Posted By: customsuburb
Subject: fiberglassing from the inside
Date Posted: January 17, 2004 at 10:42 PM

This is probobly a stupid question but here goes. I was thinking about using fiberglass to make the front of a sealed 12" sub box angle inwards kind of like this box
posted_image

(except i would be using just a JL audio 12" W1.

My question is that i have heard that you should fiberglass from the inside so the enclosure is stronger, but how would I have access to the inside of the box after I have wrapped the box in fleece (or what ever material i use) and put the first coat of resin on. I dont see how i could fiberglass it from the inside by reaching in from the outside. By the way the box i would be fiberglassing would have about 1.25 cubic feet of volume. Any help would be greatly appreciated.

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Replies:

Posted By: Velocity Motors
Date Posted: January 18, 2004 at 1:07 AM

You do it in a two part process. Do the entire tub of the enclosure first and then thicken it up enough for the proper volume, then when you have the proper volume, you finish it off by placing the top on.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: customsuburb
Date Posted: January 18, 2004 at 1:31 PM

Im confused, is the tub the inside or the out?

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Posted By: Velocity Motors
Date Posted: January 18, 2004 at 3:38 PM

The tub is the inside of the enclosure before the top gets fiberglassed on.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: customsuburb
Date Posted: January 18, 2004 at 7:55 PM

Ok i was planning on making a square MDF box for my sub. I would leave the front blank though(where i would be fiberglassing) because i was hoping to only have to fiberglass the front part and not the tub of the box. I would then carpet the outside mdf part of the box and paint the front part that is indented inwards. Should i fiberglass the tub also or just the sucked in part? Would going from caperted MDF to fiberglass look ok on the edges or would it just be best to fiberglass the whole thing inside and out. please answer my questions if you have time.

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Posted By: audiomechanic
Date Posted: January 18, 2004 at 11:32 PM

i think what Jeff was saying would be to build the box so that the front(where the sub will be) and the back( the opposite side of the enclosure) are open. you will have 4 sides. then mount your ring, lay the mold fabric, then resin it. from there you can add strength to the back side of the resined front thru the open back area. then when you have it strengthened, put the back on.

that sounded more clear in my head, hope it came out that way.

Trevor

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Posted By: customsuburb
Date Posted: January 19, 2004 at 1:11 PM

Thx audiomechanic. I understand now.

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