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Old 12-01-2009, 09:51 PM
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C4 Corvette qtr panel splice help PLEASE

I am finally getting to work on last winters project I am sectioning the qtr panel and would like some clarification on if I am approaching this repair correctly. I know some would say the correct way would be to replace the entire panel. This is a budget project and I am hoping to learn from this process. I have snapped some photos hoping that helps. I cut the damaged panel at the center of the bonding seam, I used 3m 8515? panel bond. When it has set 24 hrs. I plan to grind the seam out to a taper and lay Evercoats SMC resin and fiberglass mat over the seam to build back up. then final fill with Evercoat Rage filler and Glaze. Once the body work is straight and feathered back, does it be epoxy primed? I plan on Urethane prime and block vehicle complete. Thanks
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Old 12-02-2009, 07:10 AM
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I would give Shine a PM and ask him, he is our dedicated Corvette body man on this forum.

Vince
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Old 12-02-2009, 07:55 AM
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Quote:
Originally Posted by 35prog
I am finally getting to work on last winters project I am sectioning the qtr panel and would like some clarification on if I am approaching this repair correctly. I know some would say the correct way would be to replace the entire panel. This is a budget project and I am hoping to learn from this process. I have snapped some photos hoping that helps. I cut the damaged panel at the center of the bonding seam, I used 3m 8515? panel bond. When it has set 24 hrs. I plan to grind the seam out to a taper and lay Evercoats SMC resin and fiberglass mat over the seam to build back up. then final fill with Evercoat Rage filler and Glaze. Once the body work is straight and feathered back, does it be epoxy primed? I plan on Urethane prime and block vehicle complete. Thanks
The first thing I think of is how much easier C5 is to work on!

But honestly, I wouldn't have spliced it there, I would have brought it up to the door. Vince is right, Shine is the guy, I am no Vette specialist. But I see that straight vert splice as a ghost line down the road. I would have never spliced it like that. Maybe there is no better way and that you have to make the best of a splice like that. But I think going to the door jamb would have been the way to go.


That, or repair what was there.

Brian
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Old 12-02-2009, 08:34 AM
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I agree with Brian, that is probably not the best place to splice it. Your there already so that is beating a dead horse. I think you can eliminate any possibility of a ghost line by using proper materials and procedures that is why I recommend you shoot shine a PM.

Vince
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Old 12-02-2009, 10:24 PM
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Thanks guys, I agree, not the best place to splice it. The reason for it is that I used a coupe qtr not a conv. (would have been a section line on top either way) I am aware of ghosting or telegraphing issues in the sun, being black won't help. Wish me luck. We'll see.
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Old 12-02-2009, 11:18 PM
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If you bond it in with a bond strip behind the seam you can then grind down the outside creating a wide "V" to hide the seam under Everglass or some other fiberglass reinforced filler.

Brian
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Old 12-03-2009, 12:46 AM
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I really don't think it will be a problem since it's not structural. The C4 panels as you have found out are all glued to the frame. If you double the back side of the seam you will be fine...been there done that. Just try to keep the Rage as thin as you can and build up with glass and resin.
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Old 12-03-2009, 06:15 AM
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Shine is in a pissing match with a CA moderator and won’t post, so if second string is OK, I will give it a shot.

First most important thing is starting with the 84’s the panels on these vetes are very bad at expanding and contraction and soak things up like a sponge.

This job you are doing is a very difficult repair to make without the seam showing down the road, it can be done but even the most experienced body shop that work on vettes everyday would not make this repair.

This will be a condensed version as writing for me is like most people being beat with a baseball bat.

With a 24 grit grinder V grove both parts if done right the paint to paint gap will be 2-3 inches wide.

Make your bonding strip; I like a four inch wide one, so you have 2 inches on each side.
You can make the bonding strip a number of ways, but easiest in this situation may be cutting a 4 mill plastic and spreading either the 3 m stuff about an 1/8 inch thick and when dry the plastic will pull off, or you can use “FE’S Fiberglass adhesive” (120 a gallon) to make your strip because of curves you will want to make in separate pieces and paste together when you glue the strip to the underside of the car panel and finish out with and 80 grit DA at that point..

On this vette model DO NOT use any wax and grease remover or solvent of any kind on raw plastic. PERIOD!
With boding strip glued to car fit the new panel and trim so there is a 1/16 gap, do not butt up tight. Glue and fit.

With 80 grit DA sand all the paint surface about six inches to each side.

Next and your most important step, brush a coat of epoxy over the seam, overlapping the sanded paint, let set one hour and do a second coat. Let set over night.

Next and use only the Fiberglass adhesive above to fill the seam, you CANNOT use glass or duraglass type, or body fill on this model.

Block out and any low spots, reapply, this step must be perfect and don’t even think of filling an imperfection with any glaze or other filler.

Spray two coats of epoxy, next day, I would then the following day block the epoxy with 180 dry to make sure the repair is perfect and then epoxy before going to a 2K primer.
This is not a car to use the 2K primer as liquid bump, or problems will arise.

This is short and sweet, so if you run into any problems call me.

Cell 404-307-9740-5am-10pm EST.
Barry

EDIT:
Also the vette panel adhesive I believe is call 850, not sure as my gallon is at home but any jobber will know and there is NO substitute for this product that can be used with success, long term.
I have most of the time did my seam filling with Duramix or Fusor, I don't have the confidence with the 3M to recommend that and it will be easier to sand the FE, to shape the bonding strip and level the seam.

Last edited by BarryK; 12-03-2009 at 06:31 AM.
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Old 12-03-2009, 07:43 AM
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Good info Barry. snkbyt, I woke up this morning with this thread on my mind (don't you just hate that) and the thing that popped out was my suggestion of "Everglass". As Barry mentioned you can not use "Everglass" (An Evercoat protuct) being it is not for SMC as this Vette is made from. "Fibertech" is the filler needed.
I would make the bonding strip from the patch OR the old quarter it's self. That way it is the perfect shape to begin with. You use what you cut off the patch or what you cut off the car and then just trim it down to a few inches and there you go, a bonding strip.

When you bond that strip in, you want to grind both it and the back of the panels you are applying it to well, then apply the panel adhesive to both the bonding strip and the back of the panels and spread it on with pressure to ensure the adhesive is pressed into the scratches. Then when you press the bonding strip into place you know there is good contact between the adhesive and bonding strip to the back of the panels.

Brian
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Old 12-03-2009, 07:52 AM
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Quote:
Originally Posted by snkbyt
I really don't think it will be a problem since it's not structural. The C4 panels as you have found out are all glued to the frame. If you double the back side of the seam you will be fine...been there done that. Just try to keep the Rage as thin as you can and build up with glass and resin.
Bad info IMHO and will cause problems down the road...sorry.


Vince
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Old 12-03-2009, 08:10 AM
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Quote:
Originally Posted by 302 Z28
Bad info IMHO and will cause problems down the road...sorry.


Vince
Yep, I agree, fibertech and bonding adhesive are the way to go. And in fact, the fibertech is recommended as a bonding adhesive on SMC.

Be sure if you use any product on here that it is SMC recommended if it is going to be touching the "glass".

Brian
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Old 12-03-2009, 10:52 AM
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Edit--deleted.
Shawn called and knows what to do.

Last edited by BarryK; 12-03-2009 at 11:16 AM.
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