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Paint Issues From Engine Heat?

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Old Sep 27, 2019 | 05:18 PM
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Default Paint Issues From Engine Heat?

Hello fellow forum members,

I'm looking to buy my first C3. I found a '68 convertible that looks nice and I'm very interested in it. I'm a newbie looking for opinions from you.

The seller told me the car had a body-off restoration about 14 years ago (including repaint of the original color), prior to him purchasing it. He told me, being honest, that the paint looks great but there is some specking that 'looks like acne' on the front that is due to the engine heating it up over the years. He said in his opinion it is because the paint job was not done properly.

I've attached an image, but not if it's good enough resolution to see what I'm talking about (picture is from the seller). The seller also told me he replaced the manifold or the heads (sorry, newbie here), but has the original parts that will come with the sale.

I'd like to know if this might be an indication of a serious issue, or if this is common or to be expected?

Thank you in advance for any advice.


Zoom in and you can see the 'acne'
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Old Sep 27, 2019 | 05:35 PM
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Looks like "fish eyes" - that is caused by contamination on the substrate (oil, water, grease, wax, etc.) - it was poorly prepped before paint went on
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Old Sep 27, 2019 | 11:09 PM
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Thank you JPGR.

Anyone else with advice or experience with this?

I'm guessing the proper way (only way?) to correct this is to strip it down to the glass, prime and paint it properly? Also guessing to do that right, one would need to do the entire part (going from seam to seam)?

Not knowing anything about this, I'll ask, can this be fixed in a small area (not the entire panel) and blended in with the 'good' paint if one goes to a really great, expensive body shop that specializes in Corvette body repair?

Also, anyone have any any problems with the heat generated by replaced parts the seller told me about (heads, manifold?) that the seller told me? As mentioned, he has the original parts and said he switched them to make it run better on premium (93) and in doing so alleviated pings he experienced while the original parts were in.
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Old Sep 28, 2019 | 02:45 PM
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Lousy prep work makes for lousy paint finish.
Whatever way you go if the infected area is not properly taken care of it will happen again.
That could get expensive, if you don't have the means to do it yourself.
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Old Sep 28, 2019 | 04:00 PM
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That photo is really hard to tell. Do you have a higher res/ better photo? Fish Eyes can be caused by improperly setup painting equipment. i.e. spray nozzles not setup correctly, not enough air to atomize paint correctly, too much air, water in air. I would think that you would see it everywhere in the car unless they painted it a panel at a time over a period of time. I guess its possible that the setup got bumped during painting. I'm learning to paint, and have done a little and have experienced fish eye before.
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Old Sep 28, 2019 | 04:25 PM
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Originally Posted by SunglassesGuy
That photo is really hard to tell. Do you have a higher res/ better photo? Fish Eyes can be caused by improperly setup painting equipment. i.e. spray nozzles not setup correctly, not enough air to atomize paint correctly, too much air, water in air. I would think that you would see it everywhere in the car unless they painted it a panel at a time over a period of time. I guess its possible that the setup got bumped during painting. I'm learning to paint, and have done a little and have experienced fish eye before.
@SunglassesGuy - the pic is from the seller - kinda the best I could get. I'm reattaching another try to see if this might be better to see.


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Old Sep 29, 2019 | 03:10 PM
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that needs to be completely stripped I doubt engine heat did that
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Old Sep 29, 2019 | 03:28 PM
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cusinart is right. That paint issue is not from engine heat.

Not an expert on painting but I don't believe that's from poor prep either. I believe the water separator allowed moisture into the paint or some moisture was in the gun.

Either way, not good. That will NOT buff out.
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