bonding FG to MDF, resin or glue?
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=56107
Printed Date: April 25, 2024 at 11:34 AM
Topic: bonding FG to MDF, resin or glue?
Posted By: danieljaluise
Subject: bonding FG to MDF, resin or glue?
Date Posted: May 20, 2005 at 12:07 PM
what is better to bond/seal a fiberglass mold to a piece of MDF? I thought that I would use liquid nails between the two surfaces, then press them together and use fiberglass on the outside seam. Is this a good idea, or should just stick strictly to fiberglass?
Replies:
Posted By: danieljaluise
Date Posted: May 20, 2005 at 3:16 PM
please someone reply because I'm doing this tonight and I dont want to pick the wrong option and F up(again).! haha
Posted By: DukeDuke
Date Posted: May 20, 2005 at 3:43 PM
IMO I would just resin the MDF and then put the FG piece on and if you can wrap some glass around it to give it a for sure hold, glue might work, but you would have to have a specal glue, I dont think wood glue would do very well... good luck man, and send us some pics of... whatever you are doing.
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Duke Duke
Posted By: danieljaluise
Date Posted: May 20, 2005 at 4:54 PM
thanks duke. Its a spare tire enclosure by the way.
Posted By: beatjunkie
Date Posted: May 22, 2005 at 9:25 PM
no! the proper this to use is bondo...trust me
Posted By: oonikfraleyoo
Date Posted: May 23, 2005 at 9:22 AM
Do What?? DO NOT USE BONDO!! Bondo is in no way the right thing to use. Dude, what are you talking about? ------------- Nik
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Posted By: MVAP
Date Posted: May 25, 2005 at 2:09 AM
oonikfraleyoo Do you have a jeep cherokee truck???? Is so FG projects have you done because I have on and need Ideas. ------------- I love Car Audio!
Posted By: davedyer79
Date Posted: May 25, 2005 at 8:27 AM
Yes, please don't use bondo, it will crack out within the first minutes of hitting. Bondo is a body filler, applied to smooth bumpy, crinkled surfaces, and should only be applied in very thin coats, especially on a sub box. Use resin. Soak it to the MDF and to the mold, and if you can add a layer or 2 or mat in the seam, do that. Good luck.
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davedyer79
Posted By: abovestock
Date Posted: June 17, 2005 at 3:27 AM
Super glue it places that it touches to hold it, then resin and thin mat such as 1/2 ounce or even 3/4.post some pics and good luck.
Posted By: us_test
Date Posted: June 17, 2005 at 8:10 AM
Hit it with the MM (MiracleMix) (I just did this las night). 1 to 1 parts bondo and resin mix + small amout on hardener that comes with the bondo. Cures in about 3 hours and it holds like hell. Finish is glass smooth and it self levels when you paint (the mix you make will be like mustard in consitency). I would highly recommend this as a finishing coat for ANY FG PROJECT you will save a ton of time in sanding (you'll do maybe 10% of the sanding it would take if you did not use it). ------------- (1) Kenwood Excelon Head Unit KDC-X589 (24 bit Burr Brown DAC, 3 X 4 volt RCA).
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(1) Hifonics 6.5" Atlas Components (18db crossovers).
Posted By: 97blackrodeo
Date Posted: June 17, 2005 at 9:04 AM
definately stay away from glue(s). resin would be your best choice. lay some mat over the mdf and the fg piece, and saturate, saturate, saturate. get the bubbles out though.
Posted By: MVAP
Date Posted: June 17, 2005 at 9:26 AM
How would you get the bubbles out??? Sorry! I'm learning as I go along. I new to fiberglassing also. ------------- I love Car Audio!
Posted By: davedyer79
Date Posted: June 17, 2005 at 9:39 AM
This is what 97blackrodeo is trying to say, and myself also. Put the fiberglass piece up to the MDF that you want to bond to. Mark outside line with a sharpie (marker). Cut or tear some matting to put around the mark and resin the crap out of it. Immediatley put the fiberglass piece to the MDF before the resin dry's. Then you can add some layers to the ridge from the MDF to the fiberglass. To get the bubbles out just keep adding resin and pat the cloth with your brush. You don't want to brush the resin on, you want to blot, or pat it on to penetrate the material. On a side note, I don't see why you can't bond the MDF to the fiberglass with liquid nails, as you said at the first of the post. I would also resin the outside or inside of the box for added structural integrity. You could run a thick bead around the lip of the fiberglass piece and attach it to the MDF. Be sure to let it dry overnight, and be sure to add some matting around the area that you bonded to. ------------- davedyer79
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