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Old Sep 3, 2005 | 05:55 PM
  #1  
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Default GelCoat

Does any old corvette lover know about gelcoat, I am wanting to know that if you bust throught it, to the fiberglass in vairous spots, will it matter once it is painted?
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Old Sep 3, 2005 | 07:42 PM
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Originally Posted by name2320
Does any old corvette lover know about gelcoat, I am wanting to know that if you bust throught it, to the fiberglass in vairous spots, will it matter once it is painted?
On a C5? The body panels are Sheet Molded Compound (SMC). No gel coat. If you sand it and you belive the the glass is exposed, no biggy. Epoxy primers will seal the bare fiberglass.

If you're talking about and old Vette C1 or C2 and early C3, then the gelcoat is there and seals the glass, but again, modern epoxy primers will seal it just as well. No need to deal with gel coat unless you have an old Vette and you're into originality.
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Old Sep 3, 2005 | 08:16 PM
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Gel coat is like peanut brittle.... in 50's corvettes body panels were made with 70 % gel coat and 30 % fiberglass fibers, this gel coat was very brittle and was common to see entire C1 bodies with spider cracks all over, in the 60's the formula changed to 60% gel coat and 40 % fiberglass fibers...cracking was evident around the corners of the hood and the corners of the headlamp doors... in the 70's the gel coat was 50% gel and 50% fiberglass fibers , all under pressure... the C3 bodies had plenty of flex and cracking became much less of an issue... In a gel coated car, the gel coat went completely through the body panel, these panels were not what is referred too as Hand layup... they were made using a pressure layup process.
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Old Sep 3, 2005 | 09:17 PM
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If you are asking about a C5, it "ain't" fiberglass.
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Old Sep 4, 2005 | 12:03 AM
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Default Thanks all

I am putting on a C5R body kit, from c5west.com. The fiberglass and fitment are really bad so I have to add in some area and fill in some areas. I have sanded through gel coat in some spots and was wondering if I needed to gelcoat it again. Or just smooth it down and paint it.
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Old Sep 4, 2005 | 12:25 AM
  #6  
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Originally Posted by name2320
I am putting on a C5R body kit, from c5west.com. The fiberglass and fitment are really bad so I have to add in some area and fill in some areas. I have sanded through gel coat in some spots and was wondering if I needed to gelcoat it again. Or just smooth it down and paint it.
If you see fiberglass fibers, you need to apply a mixture of resin ( gel coat ) and cut up fiberglass cloth, and apply it to the area, I am assuming this kit is made from and hand lay-up mold, where they spray resin in the mold ( The mold has a release agent ) then fiberglass cloth is applied, then more resin and more fiberglass,etc. The problem with hand lay up is the layers of cloth may not be suspended in gel, and if not sealed they could lift in the paint process... I suggest that no matter what you do, that you apply a fiberglass sealer, before you primer, the sealer acts like a bridge between the fiberglass and the paint... you can also use a filler like "Everlast" to fill in low spots, once the body is where yo want it, you apply the sealer, then you prime it, then paint it...
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Old Sep 4, 2005 | 12:34 AM
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Default thanks evil twin

I am hoping to have it done shortly, this will make it even better. I am mixing a C5R kit with a tiger shark rear fascia. Other than extreme poor workmanship from C5west it is turning out to look really different.

Thanks again
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Old Sep 4, 2005 | 12:41 AM
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Originally Posted by name2320
I am hoping to have it done shortly, this will make it even better. I am mixing a C5R kit with a tiger shark rear fascia. Other than extreme poor workmanship from C5west it is turning out to look really different.

Thanks again
I hope you are taking pictures of all stages of this process... some for us here on the forum, but some also for your grandchildren 40 years from now.
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Old Sep 4, 2005 | 12:54 AM
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Originally Posted by name2320
I am putting on a C5R body kit, from c5west.com. The fiberglass and fitment are really bad so I have to add in some area and fill in some areas. I have sanded through gel coat in some spots and was wondering if I needed to gelcoat it again. Or just smooth it down and paint it.
Have the car sealed with an epoxy primer. I did the nose on my 74 that way. The aftermarket nose was a hand laid fiberglass part. Epoxy primer is the process today. You don't want to have to mess with sanding bare fiberglass or resin.

Who's painting the car? What brand of paint are they/you using? Most lines have a quality epoxy primer that flows very well and sands easily. I used PPG on the 74 and lightly scuffed the epoxy primer and then applied 2 coats of K36. I block sanded the K36 with 800 grit and then painted the base coat clear coat.
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Old Sep 4, 2005 | 01:06 AM
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Default Sounds good

sounds like your 74 turned out great. I haven't taken any pictures of the C5, it looks ruff and wide now, but I will soon bedone. The car M Yellow with black top, so I will go back with that color. I don't know who makes the M Yellow.
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