black tar spray
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=13187
Printed Date: July 23, 2025 at 9:04 PM
Topic: black tar spray
Posted By: daslabb
Subject: black tar spray
Date Posted: May 05, 2003 at 4:05 PM
What is that black tar stuff that I have seen on boxes?I'm planing on building a sealed with one side plexi.Is it a good idea to use that stuff on the wood part? If so where can I purchase that stuff from.
Replies:
Posted By: kustomcarluvr
Date Posted: May 05, 2003 at 6:24 PM
Hey, Well I am not sure exactly what the stuff is because everyone uses different stuff. Usually if it is mainly in the edges it is just to help keep an air tight box, if it is all over it is to keep it sealed air tight and to also add to the box (take away some air space, for tuning). I have seen peple use spray in sound deadening, it is said to keep from losing the sound through the wood. I have heard that this works great, and makes a large difference in sound by keeping it where you want it and not haveing the rattles that a box may usually have. I have also seen people use Duraglass to make the box air tight and a little stronger.
Posted By: auex
Date Posted: May 05, 2003 at 7:12 PM
It is called rubberized undercoating and you can get it at any autoparts store or walmart carries it.
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Posted By: chkdsk
Date Posted: May 05, 2003 at 10:30 PM
daslabb, Here https://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=268-250&DID=7 is an example of Spray Quiet Dampening. When we build boxes out of MDF, we use PL Premium to seal (glue) all of the edges as it never really dries, it just seals forever. We also coat the internal corners/joints of the box with 'small-fiber' autobody glass filler then we usually coat the internal with sound dapening material for adding performance. I actually haven't used the spray BUT it says that one can will cover one door SO it must go on pretty thick.
Posted By: chasesaccessori
Date Posted: May 21, 2003 at 12:26 PM
another trick you can do is to get some of that bed liner spray. This not only seals the box but also adds sound deadening and vibration control which helps stop fatege with the MDF, nails or screws, and glue. That's the only problem with using fiberglass resin, It fails over time. At least if the box is used hard.
If your design warrants using internal bracing make sure that you router all the edges off so that the air moving inside the box moves smoothly around the brace. I would stick to using MDF strips cut about 2" wide for the braces and make sure that the braces do not touch the woffer at all.
Most of all. Take you time and do it right the first time. Don't let your buddies rush you into building a junker box.
Using these methods you will build a box that really rocks(as long as your air volume is correct).
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