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Old 11-12-2007, 04:33 PM
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Fiberglass Bonding on steel

Hi guys, jusk looking for some advice, It's pretty simple, I have a steel hood, and I want to bond on a fiberglass hood scoop on it, I would like to know how you would tackle this project, I want to do it professionally, no hardware store materials, only the real stuff. I have autobody experience (work in bodyshop for 5 years) and have access to materials. We currently use Fusor 2 part glues, but I also have experience with SEM and Kent. What glues would you use, there are so many. This is my first time, and hope that it'll be a success!

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Old 11-12-2007, 05:44 PM
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Hoods flex & get hot, thus fiberglas bonded to steel will crack with the expansion & flexing. Mech fastners can even look better than bonding.

Don Meyer, Mech Engr
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Old 11-12-2007, 06:15 PM
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I have been working with fiberglass for over 30 years including making complete body panels of all types mostly mopar because they are not available commercially,so the racers come to me.I custom made a FG cowl induction scoop for new interiors LUV truck in 1995 and it has not cracked yet. Start by marking the hood where you want the scoop.Then drill holes about every 3 inches and screw it on with sheet metal screws,they are only temporary.Next unscrew and grind hood where it will be bonded with 36 grit for a good anchor pattern,also under scoop.Then clean both parts with alot of acetone.I used dynaglass but I hear vette bond is great also.Mix just the right amount of activator so it will harden but not too fast as slower will make a better job.Spread where needed for bonding and screw the scoop to the hood,leave overnight for proper cure.Next remove scews and grind off excess and gelcoat from topside of scoop for bonding and blending the top outer edge,again allow ample cure time then if you are a body man you should be able to finish from here.Let me know how you do.
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Old 11-13-2007, 09:34 AM
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Use the SEM fiberglass to metal structural epoxy and as long as you prepped it correctly you wont ever have to worry about the bond area cracking. My daughter put this stuff to the test on her 93 del sol and it tore the metal or the glass but not the bond when she would tear the fiberglass bonded bumpers off the car. After bonding finish like normal with the blend in body work.
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Old 11-13-2007, 04:07 PM
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Excellent, it's what I had in mind. These 2K adhesives are really hard to beat, but I'll have to find something similar in the Lord Fusor brand since it's what we use in the shop.
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Old 11-13-2007, 07:58 PM
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Fusor makes and adhesive designed for this, you'll need to apply epoxy primer over the bare metal first and allow it to cure overnight-then use the adhesive to bond the fiberglass part on, then finish with traditional fiberglass and fillers. I did a step by step on this awhile back-should show up if you do a search.
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