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Old 04-24-2005, 07:43 PM
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long term primer

I am currently doing some body work on my '99 chevy silverado and am looking for a primer that I can leave on for a long time w/o rust forming. The truck will not be ready for paint for quite a while, so while I'm still working on it, I'd like to leave it in primer. Does anyone have any suggestions on what primers/sealers would yield the best results? Thanks.

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Old 04-24-2005, 08:19 PM
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epoxy primer will be the way to go.
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Old 04-24-2005, 08:28 PM
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Epoxy for sure if you plan on still driving it or it will be outside any.
Epoxy is the only good way to go as it hardens after a week or so and provides a sealed barrier against moisture. You can do your body work on top of it after a scuffing with 180 so don't worry about sanding it off to add filler if needed.
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Old 04-24-2005, 09:43 PM
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Yup

Epoxy is the way... Two coats for maximun corrosion resistance..

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Old 04-25-2005, 04:43 AM
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thanks for the help. will the epoxy have to be top coated, or will it hold up on it's own? Also, which epoxy do you recommend?
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Old 04-25-2005, 07:08 AM
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Yes, it will need paint as epoxy has no UV protection and will eventually start to deteriate. That will be awhile though as I sprayed a single coat on the top of my old van to keep it from rusting till I "got around to it" and that was 4 years ago and it is just now starting to see a little rust.
If your happy with the finish,on like the frame,underside,jambs,areas that won't be seen,you can just scuff with 180 if it's been more than 7 days after applying (check with your supplier on recoat window of the specific epoxy) and paint SS or BC/CC right over the top. If your using new panels that don't require blocking to get straight,you can shoot over that as well.
It's best to shoot another coat of epoxy over the body work to seal the filler.
Regular 2K primer will work but it will soak into it and require more coats to hide.
Most ANY epoxy is good, Send BarryK a PM for some info on the SPI products,Really good stuff at a good price.
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Old 04-25-2005, 11:14 AM
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sounds good man. thanks alot for the help.
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Old 05-02-2005, 05:57 PM
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Hey Guys, on this same subject, If I use high build primer,like dura build from evercoat, it's an acrylic should or can I use an epoxy over it to seal? I'm having to let my truck sit on the back burner for a few months and would like it to be ready when I am. Thanks,
I'm in sunny Arizona moisture is not a problem,,
Thanks again, Bob
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Old 05-02-2005, 06:33 PM
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if its going to sit then put epoxy over the 2k. moisture will eventually go through a 2k primer. epoxy seals but as stated before uv will eventually break it down and in arizona probably faster. i wouldn't begin to give a time estimate but i think it would hold up for a minimum of 6 - 12 mos out there. i used to have relatives in your neck of the desert and the sun is definately intense. barry might be able go give a better estimate.
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Old 05-02-2005, 09:42 PM
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My actual test on Nason epoxy FWIW.
I shot the top of my old van as it was rusting thru the OEM paint job till I could "get around to it" so's it wouldn't rust any more than it had.
Did a 180 clean up and shot ONE wet coat over the whole top.
That was in Spring 2001.
It is just NOW starting to show a little rust on the channel edges of the roof.
The majority of the top is still in good condition.
This has sat outside continously and thru one of the hottest summers on record,2 MAJOR ice storms and several snow's,and 1 tornado.
Epoxy is AMAZING stuff.
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Old 05-03-2005, 12:12 AM
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Hey thanks guys, my truck will be under cover for the duration of it's time on the back burner, uv should not be a problem. I just want to save some time and arm use when I get back to it. know what i meen,,

Thanks guys Bob,,
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Old 05-03-2005, 12:24 PM
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Quote:
Originally Posted by mrcleanr6
if its going to sit then put epoxy over the 2k. moisture will eventually go through a 2k primer. epoxy seals but as stated before uv will eventually break it down and in arizona probably faster. i wouldn't begin to give a time estimate but i think it would hold up for a minimum of 6 - 12 mos out there. i used to have relatives in your neck of the desert and the sun is definately intense. barry might be able go give a better estimate.
**********************************************

I'm not so sure we have the answer to this anymore.
Forever the manufacturers me included have been saying 3-9 months as a top coat before chalking.

In the past no one really cared as epoxy was used for frames and under-hoods for restorations and do not get sunlight anyway.
Now with the Rat rods were seeing a lot of epoxy as outside paint.

I went into a shop that does nothing but rats about six months ago and he had been putting my black on the rods. I advised him that they will chalk inside a year and he pointed to his and said thats 3 years old. However do keep in mind, these cars are not driven everyday.

Now what has changed? has VOC or resin changes because of VOC's made the epoxy better or is it because their using Black that has some UV protection anyway and the white and gray with less black may not hold up?

In other industries, epoxy is cured in different ways PCI's (UV), Moisture cured and Isocyanate's. With the different applications epoxy is now being used for this may be something to look at to see if any of these have better UV protection for automotive. I don't know!

When I get done with Dallas and Mexico, I will do some UV testing and let you know and study up on the other activating alternatives.
bwk
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Old 05-04-2005, 07:52 AM
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Hey, guy's thanks for you inputs.
I've been beating myself up over what to do here.
I'd much rather just finish the truck and put the house on the back burner,
But thats not going to happen,we all know why,RIGHT,,
My girls not that bad,, I just have to,,, gitter done,,,, It's also my shop and my two dogs I have to build a fence and organize my new shop,thats the fun part of this house.
Bob,, in the desert

Last edited by 70Shorty; 05-04-2005 at 07:58 AM.
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Old 05-04-2005, 08:09 AM
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I've got some of PPG's old DP50 grey and also some DP90 black on my old plow truck that's been there for 9 years now outside everyday and exposed to the abuse related to snow removal and hauling firewood. Both colors seemed to chaulk up after 2 years but both are holding up just fine with no corrosion on the bare steel that lays below. Epoxy rocks for durability IMO.
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Old 05-04-2005, 11:50 AM
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Bob,

Thats the great thing about epoxy is chalking does not mean its destroyed.
chalking is just the top layer dieing and its still good underneath.

Used a good bit on ocean boats as a bottom coat (below waterline) because the barnacles will attach and as the epoxy chalks from sunlight going through the water the chalking part falls off as well as the barnacles and the process starts over.
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