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Reload Thread: epoxy resin vs polyester resin sealing inside subwoofer box

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    epoxy resin vs polyester resin sealing inside subwoofer box

    I'm just wondering what is people's preference when it comes to sealing up your box?

    epoxy...635 thin or150 thick?

    poly...404 tooling or 435 standard

    or maybe you have used something else?







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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    caulk to seal seams, but tight glue joints don't even need that...




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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    You talking a coating/lining of all interior walls?



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    lol, Im going a bit overboard with my build, but Im using liquid nails, course thread drywall screw, caulk, bondo (all in seams and joints), and 404 resin covering entire inside with mat covering seams and joints



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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by mlstrass View Post
    caulk to seal seams, but tight glue joints don't even need that...
    not what I mean...





    Quote Originally Posted by ciaonzo View Post
    You talking a coating/lining of all interior walls?

    exactly!




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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by Durango03 View Post
    lol, Im going a bit overboard with my build, but Im using liquid nails, course thread drywall screw, caulk, bondo (all in seams and joints), and 404 resin covering entire inside with mat covering seams and joints
    so you added mat with 404 resin, with just 404 do you think if it flexs the resin will break or crack as 404 is the most brittle no?

    have you already built this or still under construction?




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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Still under construction. there is a build log on here. But no I dont believe it will crack. the enclosure will be ridiculously sturdy with the other compounds as well as the 2x3 bracing Im going to be throwing in there.. it wont see much (if any) flex to allow cracking.. Also from other threads I have read, adding resin to the inside is always a good idea to contain the air that escapes (while the use of resin is debatable as far as usefulness goes). The one thread that sticks out in my mind, the OP advised everyone to place a vacuum hose on a piece of MDF and feel the air being ****** out on the opposite side.. resin will prevent the issue.



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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    liquid nails ***** ***, use wood glue on wood. Crazy concept I know...

    All the other crap you're doing is not needed, but if you feel inclined then have at it.

    FG resin/mat does nothing to make a box stronger unless you lay it on 1/4" thick. Single layer is a waste of time and $$$...

    As for that video, not buying into that. Static electricity perhaps. Light a candle, put a big piece of MDF in front of it, now hit the MDF with 125psi from an air compressor. Tell me if the candle blows out...




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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    I shot this video using our cnc router the other day at work. I never though mdf was this porous but the video kinda proves that it is.

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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Polyester if you want to seal it. All you're doing is sealing it.



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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by mlstrass View Post
    liquid nails ***** ***, use wood glue on wood. Crazy concept I know...

    All the other crap you're doing is not needed, but if you feel inclined then have at it.

    FG resin/mat does nothing to make a box stronger unless you lay it on 1/4" thick. Single layer is a waste of time and $$$...

    As for that video, not buying into that. Static electricity perhaps. Light a candle, put a big piece of MDF in front of it, now hit the MDF with 125psi from an air compressor. Tell me if the candle blows out...
    There is a huge gain in strength when you turn anything into a monocoque-like structure.

    Also, have you ever tried breathing very fast or hard through certain fabrics or whatever and had a tough time, but when you breath easy and slow through it there's no problem? That's the concept behind aperiodic membranes, they become more resistive to higher velocities. MDF is porous, period. There are losses built into modeling programs that acknowledge facts like these.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    i agree you want to coat the interior of the enclosure - polyester resin is sufficient, a few layers of glass at the corners can't hurt.



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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    Quote Originally Posted by keep_hope_alive View Post
    i agree you want to coat the interior of the enclosure - polyester resin is sufficient, a few layers of glass at the corners can't hurt.
    I agree and I know that adding a 1/4 layer of resin is a MUCH harder surface then say adding the same amount of wood. which is why it helps gain spl. I've even seen a box made entirely out of glass and some lined on the Inside with tile.. hmm maybe I should try tile?...

    but.. as for resin type.. epoxy is not the same as poly.. poly is less then half the price and the chemicals require you to wear a mask and gloves.. not the same with epoxy.




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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    probably should have used the word "density" .. lol




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    Re: epoxy resin vs polyester resin sealing inside subwoofer box

    As far as mdf being porous and having air pass through it... Couldnt a couple layers of primer solve that?




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