fiberglass over bondo?
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=53817
Printed Date: May 02, 2024 at 11:21 PM
Topic: fiberglass over bondo?
Posted By: TwinTurbo
Subject: fiberglass over bondo?
Date Posted: April 13, 2005 at 1:03 AM
I am in the middle of working on my first FB prject. Its a rear dash/amp enclosure for a 94 300zx with mounts for some mids and a cooling fan. I bulit the mold, streched fleece over it, soaked that with resin and have the first layer of glass on already. The problem is now there are some parts that the intended shape didnt exactly take and I was wondering if it is recomended to apply some bondo to get the shape I want and then continue with the fiberglass layers after that? or should I just continue with the glass layers and then bondo in the end? Sorry no pics the wife is out of town with the camara at the moment.
Replies:
Posted By: Dyson
Date Posted: April 13, 2005 at 4:20 AM
best way i find, if you have streched the fleece, is to strengthen the inside of the box, and then use a body filler to shape any creases or ripples in the fabric. mix up a batch of resin and fumed silica to a thixotropic paste and pour all over the inside of the box, the other expensive way is to bondo the inside of the box aswel.
Posted By: oonikfraleyoo
Date Posted: April 13, 2005 at 9:33 AM
Not a good idea to put resin on top of bondo. Finish laying up your glass, then come back with the bondo. ------------- Nik
Jeeputer Progress
[|||||||||||-] 90%
Check it out.
Posted By: ncrxsi
Date Posted: April 14, 2005 at 11:23 AM
Something else you may want to consider using when trying to build up a specific area is using dyna-glass (bondo mixed with fiberglass strands(bought that way)) there are other names for it as well, kitty hair etc, it comes in short hair, long hair and a version which you can't hardly see the hairs in it. You can pick it up at most parts stores etc. But as the others have stated, get your glassing done, then you could use to build up the area you need to. For buildup, this is a lot more effective than using bondo, requires less material than bondo and it is also less likely to crack like bondo sometime does when used to build up something to thick. ------------- Dean
Posted By: ncrxsi
Date Posted: April 14, 2005 at 11:24 AM
Something else you may want to consider using when trying to build up a specific area is using dyna-glass (bondo mixed with fiberglass strands(bought that way)) there are other names for it as well, kitty hair etc, it comes in short hair, long hair and a version which you can't hardly see the hairs in it. You can pick it up at most parts stores etc. But as the others have stated, get your glassing done, then you could use it to build up the area you need to. For buildup, this is a lot more effective than using bondo, requires less material than bondo and it is also less likely to crack like bondo sometime does when used to build up something to thick. ------------- Dean
Posted By: Stanford1621
Date Posted: April 16, 2005 at 12:17 PM
What I did was cut up a bunch of leftover pieces or mat and seperated it into seperate fibers then mixed that up in the resin it worked perfect and is probaly the only thing that will work on right angles.
Posted By: danieljaluise
Date Posted: May 18, 2005 at 8:45 AM
Hey will I be ok if I start doing more layers of glass over the bondo. I put a thin layer of bondo over the glass mold I made for my wheel well, but then realized it was to thin and now I want to add more layers of fiberglass.  
Posted By: danieljaluise
Date Posted: May 19, 2005 at 2:52 PM
well.. im gonna fiberglass over the bondo anyway, because i dont think anyone knows what will happen. i think it will be fine.
Posted By: NowYaKnow
Date Posted: May 19, 2005 at 7:33 PM
Honestly I would just trash that and start over, rather than take a chance of problems down the road. If you only have 1 layer of glass with bondo on it, starting over shouldn't take long at all. If you really want to go with that one, I would try and sand most of the bondo off and make sure your last sanding is with a rough grit. What are you trying to make anyway? If it's a sub enclosure for the wheel well, there's no reason to use any bondo on the inside like that.
Mike
Posted By: danieljaluise
Date Posted: May 20, 2005 at 7:47 AM
Yeah I know I F'ed up using bondo on the inside of the wheel well enclosure I'm making. It was totally unnecessary and a waste of 10 dollars, but it didn't cause any problems. I put down two more layers of FG last night and this morning it looks fine.
Posted By: Master Asylum
Date Posted: May 20, 2005 at 10:31 AM
There really shouldn't be any HUGE problem as long as the bondo is being entirely covered and the fiberglass is able to make a good bondo with the original level of fiberglass(that way there is no risk of it suddenly releasing like crazy, at all). It's just an expensive way to make a mold that you could do fine with like, say, the green florist stuff at walmart. :)
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1998 Monte Carlo w/
Eclipse CD8454
2xRockford 5.25" Power 2-way T152C
2xRockford 6"x9" Punch 3-way FRC4369
1xMemphis 16-MCH1300 5-channel
2xKicker 12" L5 Solobaric-2 Ohm
Posted By: danieljaluise
Date Posted: May 20, 2005 at 11:55 AM
yeah you aren't kidding when you say expensive. I'm on my fourth quart of resin and probably 6th or 7th bag of fiberglass cloth. I bet I've spent over 100 dollars already just on this stuff. I should have bought a gallon container of resin.
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