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Old 03-31-2018, 10:05 AM
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Fiberglass body prep ?

Hi all i bought a fiberglass 1923 ford C cab body. I have let it sit in the sun for a few days, now i want to start the prep work for paint. I washed it, and used a waterbased grease and wax remover. My question is for the body work do i epoxy primer the body first then do the body work with filler ? Or epoxy after the body work has been done?

I am thinking
1. Epoxy primer
2. Rage filler for the body work.
3 Polyester prime high build for getting everything straight as i can.
4 Sealer.
5 Topcoat.

Am i on the right track ?

Thanks for any help.

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Old 03-31-2018, 10:58 AM
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On glass do the bodywork then the epoxy.. It fails me now for a good filler but one that goes on smooth and no pinholes as your body should be fairly straight. I would sand the body with some 60/80 to give it some tooth for the filler.

Sam
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Old 03-31-2018, 11:42 AM
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Thank you , this is my first glass body. Ok so ill do all the body work then epoxy prime.. thank you again for the help.
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Old 03-31-2018, 12:31 PM
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I used Marson Platinum filler as it spreads real well and very few or no pinholes. Plus it sands easy..

Sam
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Old 03-31-2018, 12:56 PM
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i epoxy glass after blocking with 100 . should need only min filler. for any filler i use evercoat VPA 870 .
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Old 03-31-2018, 05:34 PM
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Skipping step #1 is also a valid option.
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Old 03-31-2018, 06:46 PM
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is there any real benefit to doing the epoxy?
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Old 04-01-2018, 06:54 AM
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is there any real benefit to doing the epoxy?
I don't think you'll have to worry about rust lol.
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Old 04-01-2018, 07:06 AM
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considering the c-cab is likely made with lower tier polyester resin and the fact that epoxy is the top tier of resins should help make that call . once i have a glass body prepped i epoxy and let fully cure before moving on . but it's your call good luck with it .
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Old 04-01-2018, 07:14 AM
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You really have to “wash” with wax and grease remover. Just wiping won’t get it.
You have to get absolutely all of the mold release off or you will just spread it around when you scuff it.

I’d use 80 for the first scuff. Make sure you thoroughly scuff, not just scratch. Then repeat with 100.

If you don’t really remove the glossy surface it will bite you down the road.

Then do any body work and prep as normally done.

Glass bodies flex a lot more than steel so it pays to reinforce then.

Use epoxy adhesives on any additions on the inside. If you use the standarard Fiberglas polyester stuff it can “print” through some time later as they leach out the binders of the original construction. I found this the hard way. Fortunately I got educated before it did permanent damage and cut out my additions. West systems materials work pretty well if mixed correctly.

Byron
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Old 04-01-2018, 07:28 AM
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Thanks for all the great info guys, I'm still researching a lot before i do anything. really don't want to mess this up..lol

Just read that doing the epoxy prime will slow down the deterioration of the fiberglass over time. so i will be going that route.

Is there any difference painting on fiberglass then painting on metal?
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Old 04-01-2018, 08:48 AM
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epoxy the inside also .
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Old 04-01-2018, 09:41 AM
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Quote:
Originally Posted by Dc309 View Post
Thanks for all the great info guys, I'm still researching a lot before i do anything. really don't want to mess this up..lol

Just read that doing the epoxy prime will slow down the deterioration of the fiberglass over time. so i will be going that route.

Is there any difference painting on fiberglass then painting on metal?
Fiberglass is prone to static electricity which can attract dust to the surface while painting. Treat with an anti-static spray or wipe, and some people attach a ground strap if possible.
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Old 04-01-2018, 11:21 AM
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to add to this, no matter what you choose I'd be sure to blow it off extra good brushing it. Lots of pores in fiberglass. I'd fill with Rage Extreme and poly prime once or twice. Then 2k it or epoxy it before paint. Rust is not an issue but epoxy is top notch when it comes to a solvent barrier. You really don't want solvents leeching down to the fiberglass or at all really. It will leech the gloss right out of your clear which is die back and may cause fiberglass to move around in the sun. Think about it, the fiberglass is a sponge. You want to keep those solvents away from it. So epoxying before filling fiberglass and after is just safe guarding. Epoxy is a shrinker, so if it's a block able epoxy, even better.
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