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Old 12-18-2005, 02:35 PM
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65 Corvette Fiberglass prep for paint

I have a 1965 Corvette that was sanded down (in 1975 no less) and is some places thru the gel coat to the raw fiberglass. I am trying to find out how to clean and prep those areas before starting to finish sanding and paint. Help!!
Don

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Old 12-18-2005, 03:12 PM
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Gel coat is available by the quart. It is a little hard to spray but it will lock down the fiber glass hairs. I have also seen epoxy surfacer used with multiple coats to do the same thing.
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Old 12-18-2005, 05:32 PM
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The last year an actual gel coat was used on a vette from the factory was 1962. Yes, I know people have gel coated about every year possible but I have also seen a few vettes totaled because of this effort.
I have personally bought three vettes like this over the years.

Spray two wet coats of epoxy giving the first coat 30 minutes or longer and preferably overnight before spraying the second coat.
Let set 24 hours and spray with a 1.8-2.5 primer gun 2-3 wet coats of polyester primer.
Block sand with 180 and than go to a 2K primer for finish blocking and final prepping.

The above is assuming you have repaired any damaged area with resin as needed.
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Old 12-18-2005, 06:11 PM
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Listen to Barry, he knows his stuff. Polyester primer is one of the best products there is for fiberglass.

Vince
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Old 12-18-2005, 06:15 PM
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I'd also use Barry's suggestion.
The spray gelcoat stuff is very hard to work with.
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Old 12-18-2005, 07:47 PM
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I've seen problems with using gelcoat, bubbles, poor adhesion, etc. Take Barry's advice, epoxy then polyester, then urethane surfacer. The epoxy will provide excellent adhesion and solvent barrier. Fix any cracking first before your epoxy goes on or if you see evidence of cracks that were missed after your epoxy is on just go back in, grind them out and repair them spots then apply epoxy over your repair areas. Featherfill G2 gets my vote for the polyester primer. Bob
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Old 12-18-2005, 09:33 PM
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Barry,
Does the polyester stick ok to the epoxy. I ask because in the fibreglass/composite industry it is a sort of no-no to put polyester on epoxy for adhesion (poor) reasons. Epoxy will stick well to polyester, but not the other way around.
I am particularly interested because I have a 70 vette that will one day be repainted.
Jeremy.
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Old 12-19-2005, 03:56 AM
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I'm sure there are all different types of polyesters and some that won't work with epoxy in other industries.

In automotive, spray polyester primer is next closest thing to bodyfiller except you spray it.
It sticks great.
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Old 12-19-2005, 06:18 AM
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Actually IMO the polyester primer should go on first over bare fiberglass, since it is basically sprayable fiberglass resin, followed by a catalyzed urethane primer/surfacer. Barry is probably worried about some bleed through issues with the old fiberglass of the Vette, either method will work fine though.

Vince
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Old 12-19-2005, 05:56 PM
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Either way,

On the old glass anytime you can lock it out with epoxy especially if you have some fibers showing it can be a real lifesaver down the road.

These bodies have taken a beating over the years and this could be the 2nd or third time a mid 60's has been stripped.

For me, anytime I have Fiberglas or SMC its getting epoxied, I just figure cheap insurance.

Barry
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