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  #16 (permalink)  
Old 04-21-2009, 06:43 AM
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Thank you both for the ideas I will consider them. As far as the sem product I couldnt find anything listed in there catalog in large enough tubes to mold in a large hood scoop. Maybe its to new and isnt in there catalog yet. So you use the deck plank resin to do the attachment and molding? Is it sandable to smooth it out and where is a good place to buy it?

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  #17 (permalink)  
Old 04-21-2009, 06:49 PM
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I've got two vehicles with bonded on hood scoops, both were bonded with 3M body adhesive (don't remember the part #) and both were finished with standard body filler, nothing fancy.

Russ
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Old 04-23-2009, 05:46 AM
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The resin is available at some boat yards or marine supply stores.
It is 2 parts, It comes in 2- 1 qt. pals for 20 to 25 dollars for each part.
It is like a thick brown epoxy resin consistency and is sandable but tough to do so.
I could dig up more info, if needed for you.
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Old 05-05-2009, 10:01 PM
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Bad Idea

From what I have learned working with metal and fibergalss is that it is not good to combine the two. Each material expands and flexes at different temps and stresses. I would either go with a fully fiberglass or full metal hood. IMO
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Old 05-06-2009, 05:20 AM
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molding in scoop

You are right fiberglass & metal don't mix, mine was put on in the summer, it warps in the winter when the temp. goes down. J. R.
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Old 05-07-2009, 04:34 AM
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it wont work i've tryed save your money and buy a replacement hood. Or unless u know how to pull molds just fiberglass the scoops in place sand smooth then pull a mold from that.
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Old 05-07-2009, 02:17 PM
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Read julioDBS' post, it works well. I used the Marine Epoxy mixed with Microspheres, a powdery material, as fine as baby powder, to bond fiberglass dune buggy fenders, front end and engine tail piece to a VW steel body and mold them in, it worked great. I even caught people sitting on the fenders, they never cracked, warped, nothing. I used to take it on the beach clam digging a lot and abused it to death. The mix sets up very fast and sands really easy.
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Old 05-07-2009, 06:59 PM
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After reading here, I'm beginning to think the people who had bonding problems either were doing something wrong (poor prep? outdated epoxy?) , or just rehashing other posters' bad experiences... My S-10 has a steel hood section from an '87 Buick GN glued to it's steel hood, my Maverick has a 'glass Boss 429 scoop glued to it's steel hood. Both glued on with 3M body adhesive, both molded in with standard "bondo" (flavor of the day), neither experiencing any cracking or separating.

Russ
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Old 05-07-2009, 08:20 PM
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Quote:
Originally Posted by julioDBS
I am using a marine deck plank resin to bond my scoops to my steel hoods.
I mount mine from underneath the hood using the wide flanges on the scoop for a wide attachment area. No problems in 3 years with a half dozen completed and installed hoods. A clean and properly prepped bond area on the steel hood and fiberglass scoop are part of the procedure.
Here's one pic, not the best quality, but one I had handy.
Good advise!

Those four hood scoops are the prettiest I've ever seen. Awesome work dude! Did you mold them with your hands? Talk about frenched headlights, HABABAGAGA!

Now back to the task at hand. lol Have you ever used Marinetex? I have never had a problem with it either and it is a marine epoxy product just like deck plank resin but it spreads out and works a lot like body filler, just maybe a little bit harder to sand. Holds up great down here in the Florida sun.

The main thing that I have found is to make sure that the hood scoop properly fits the contour of the hood. I have seen guys clamp them down to make them fit and this is not good because the fiberglass will have tension in it and try to pull away. I trim and shape the mounting surface area of the scoop to make sure that it fits the contour of the hood real good. Then I thoroughly grind the the area of the bond with a 40 grit disk. Apply the epoxy and press the scoop down into it with no clamps. I then let it cure for a couple of days, sand shape and apply another layer. I also sand and apply a couple of layers of Marinetex to the underside of the hood and work it onto the underside of the scoop. This way it gives a bonded layer on both sides of the hood and scoop. Just like mounting it from underneath. Then after that I usually fare it out with a good quality auto body filler. Sand, prime, block, sand, prime, sand and paint, just like any other type of body work.

Last edited by Chris Kemp; 05-07-2009 at 08:29 PM.
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Old 05-08-2009, 05:59 AM
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Quote:
Originally Posted by S10xGN
After reading here, I'm beginning to think the people who had bonding problems either were doing something wrong (poor prep? outdated epoxy?) , or just rehashing other posters' bad experiences... Russ

I feel if you do the right prep and use an epoxy panel adhesive you are golden. These thing work great if applied properly.

Bad prep or no epoxy panel adhesive and things could start to crack and lift.
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