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Old 02-14-2011, 04:07 AM
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Fiberglass hood repair?

Ok, here is what I am working with. I have never done anytype of fiberglass work, but this wont stop me here.. Time to learn!

Upon fitting this hood, it appears to be about 3/16" short in the rear. I have fiberglass matting and resin. What would be the best way to frame this in to extend the rear portion. Here are some pics of what I am dealing with. The hood is VERY light, and very flimsy. We are talking about adding some small tubing structure to the bottom to help strengthen it up without adding weight.

But right now, my main concern is getting the rear portion is fit properly.




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Old 02-14-2011, 04:45 AM
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I was thinking about cutting a thick piece of cardboard, taping it to the top side of the hood, and line it with duct tape. Then flip the hood over and apply the fiberglass material.

A quick internet search from multiple locations sais that the resin will not stick to the duct tape. Any truth in this?
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Old 02-14-2011, 04:49 AM
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It may be easier to add metal to the cowl panel if thats what you are more familiar with. Is the big hole in the nose for a turbo by any chance?
Shane
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Old 02-14-2011, 05:25 AM
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Adding metal to the cowl portion of the car itself really isnt an option here. I'm looking to extend the back portion of the hood about 3/16".
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Old 02-14-2011, 05:30 AM
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Quote:
Originally Posted by Chevrolet4x4s
Is the big hole in the nose for a turbo by any chance? Shane
That's where the 155mm cannon barrel goes.
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Old 02-14-2011, 05:35 AM
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It will swallow children and small pets

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Old 02-14-2011, 05:40 AM
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Where's the radiator?
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Old 02-14-2011, 05:41 AM
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It's a smaller unit that mounts off to the side. You can see some of the tubing structure on the lower drivers side.
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Old 02-14-2011, 06:44 AM
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Quote:
Originally Posted by orangejuiced86
I was thinking about cutting a thick piece of cardboard, taping it to the top side of the hood, and line it with duct tape. Then flip the hood over and apply the fiberglass material.

A quick internet search from multiple locations says that the resin will not stick to the duct tape. Any truth in this?
It usually doesn't stick,but some brands will wrinkle up. I usually use the blue painters tape and put a coat of wax to make sure it doesn't stick. One of the key parts to extending any fiberglass part is to grind the edge to a sharp bevel or it will leave an air pocket on the other side as fiberglass does not like sharp bends.As far as bracing,I use florist foam and bevel the edges. I doesn't have to be too thick depending on clearance under hood.The foam is only to hold the glass in shape until glass cures.If you use something solid,when it cures it will shrink just like when welding on steel and show through on top side. The foam will crush instead of pushing the top up.Hope this helps.Also use mat instead of weave and tear the edge that is going on the hood so it disappears and looks like you didn't add anything.Also use just enough resin to wet out the glass,resin without glass will crack.Use a roller to get out air bubbles for a better and neater job.
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Old 02-14-2011, 07:49 AM
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Very cool! Thank you very much for your reply!
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Old 02-14-2011, 09:59 AM
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Instead of using metal tubing to strengthen the hood, consider
using thin strips of wood which are glassed into the bottom structure.
You could even use a strip of wood to help extend the rear of the hood.

This will make it very light and extremely strong.
Think boatbuilding.....
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Old 02-14-2011, 10:08 AM
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Very good idea! Thanks!
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Old 02-14-2011, 11:06 AM
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fiberglass hood

Quote:
Originally Posted by orangejuiced86
Very good idea! Thanks!
I agree with the wood, Glass will not stick to metal very long, the metal starts working its way loose. There is a resin type stuff that GM uses on Corvettes that is great but spendy, it is made to bond metal to glass. A body shop that fixes vettes should have some, I have a quart of it in my shop but I can't remember the name. Call around if you want to use it, if you can't find it post, i will go out to the shop.

Bob
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Old 02-14-2011, 11:07 AM
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Urathane foam will work too. I just did a roof hatch on a funnycar that gets sat on after a run and I used urathane foam from a aluminum foil coated board. worked great. I use West Systems epoxy and their cloth. It all is about 4x as much as polyester but very strong and easy to work with.
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Old 02-14-2011, 05:44 PM
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Depending on how much you need to build up that edge you could do it with multiple strips of resin soaked glass cloth. I did something similar on the deck lid of my 34 Ford. The gap on one side was way too wide and I made up about 1/4" of the gap by standing up the deck lid on it's side and just applying layers of catalyzed resin and cloth.

Vince
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