Trunk Paint Issue - Chevelle Tech
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post #1 of 12 (permalink) Old Sep 14th, 19, 1:54 PM Thread Starter
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Trunk Paint Issue

A few months ago I wanted to clean up the trunk area in my 67. There were a few spots of surface rust underneath the rubber trunk mat. I cleaned the rust and old paint off with a pneumatic angle grinder with a medium grit prep disk. After that I primed those spots and let them dry. I then shot those areas with the trunk spatter paint shown in the photo. All good, perfect match with the rest of the trunk. Let it dry for two days and then put the mat back in.

Last week I let my grandson clean the car before we took it to a cruise night. I went ahead and let him wet wash it, but cautioned him about spraying too much around windows, doors and trunk. He did good. After drying the outside, I opened the trunk and pulled back the mat. There was a bit of water on the left side, right where one of the rust spots had been. No big deal, I expected it. Went to blot it up with a towel and a lot of paint and spatter grit came with it. What the f***? Is this paint not water proof or resistant after drying? Was there something wrong with my prep? Should this paint be cleared afterwards? I used this same paint on my 69 Camaro with no issues.


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post #2 of 12 (permalink) Old Sep 14th, 19, 5:07 PM
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Re: Trunk Paint Issue

It is not waterproof and has to be clear coated.
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post #3 of 12 (permalink) Old Sep 14th, 19, 6:40 PM Thread Starter
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Re: Trunk Paint Issue

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Originally Posted by HKalin View Post
It is not waterproof and has to be clear coated.


Ok, thanks. I used the same exact paint in a different color on my Camaro and never had an issue with the paint coming up when it got a little wet. Iíve spilled coffee in that trunk and had water leak from an ice chest with no problems...just wipe it up. Iím guessing this isnít the same formula paint GM used back in the 60ís.


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post #4 of 12 (permalink) Old Sep 14th, 19, 7:47 PM
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Re: Trunk Paint Issue

Good to know... so maybe a coat of flat clear overtop?
Have any pictures to show how it looks? Love to see a shot of it so I know what mine will look like...!
Thanks


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post #5 of 12 (permalink) Old Sep 14th, 19, 8:47 PM Thread Starter
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Re: Trunk Paint Issue

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Originally Posted by Capt Casey View Post
Good to know... so maybe a coat of flat clear overtop?
Have any pictures to show how it looks? Love to see a shot of it so I know what mine will look like...!
Thanks


Casey


Here ya go. The most recent repair is a 3Ē x 7Ē patch near the center of the photo along the indentation.


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post #6 of 12 (permalink) Old Sep 14th, 19, 9:02 PM
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Re: Trunk Paint Issue

that came out real nice
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post #7 of 12 (permalink) Old Sep 15th, 19, 2:17 AM
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Re: Trunk Paint Issue

The rubber trunk mats tend to allow/draw condensation underneath them, and then there is no place for it to go, other than compromise the paint & then begin rusting. Not good.

In my experience, anyway.
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post #8 of 12 (permalink) Old Sep 15th, 19, 1:58 PM
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Re: Trunk Paint Issue

It looks great!
That gives me great visuals for how Mine could turn out!
Not sure if it's different for my year 68 but damn that looks good!

To prevent moisture build up in a really well sealed truck. Use the moisture absorbent packs like the type that come in electronic devices. You can buy them. Put one in the trunk and allow it to absorb the condensation them toss out and replace as needed. Now you can keep the mat and save the paint too!

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post #9 of 12 (permalink) Old Sep 15th, 19, 2:16 PM
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Re: Trunk Paint Issue

Quote:
Originally Posted by davewho1 View Post
The rubber trunk mats tend to allow/draw condensation underneath them, and then there is no place for it to go, other than compromise the paint & then begin rusting. Not good.

In my experience, anyway.
It might seem like it but rubber can't draw condensation.

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post #10 of 12 (permalink) Old Sep 15th, 19, 10:31 PM
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Re: Trunk Paint Issue

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Originally Posted by Dean View Post
It might seem like it but rubber can't draw condensation.
So does that mean he has a seal problem? Not sure what you mean here Dean. Seems like a rubber mat would block moisture from "breathing" out
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post #11 of 12 (permalink) Old Sep 15th, 19, 11:00 PM Thread Starter
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Re: Trunk Paint Issue

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Originally Posted by 64tempestwagon View Post
So does that mean he has a seal problem? Not sure what you mean here Dean. Seems like a rubber mat would block moisture from "breathing" out


Oh, I know I have a seal problem. Where I live is very dry, so not normally a problem. I also donít usually wet wash the car. I think the rubber mat does tend to keep whatever moisture happens to pool at the bottom of the trunk from evaporating quickly...thereby leading to surface rust. I just wasnít ready for ďcuredĒ GM trunk paint to turn into goo when exposed to water for 15 minutes.


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post #12 of 12 (permalink) Old Sep 15th, 19, 11:20 PM
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Re: Trunk Paint Issue

Quote:
Originally Posted by Dean View Post
It might seem like it but rubber can't draw condensation.
It can certainly trap the condensation that the metal draws. There is plenty of air gap under that mat.
If you don't have a good paint seal, covering it with a tarp will be a recipe for rust. Not sure your prep on the trunk pan, but if it wasn't a good epoxy, I'd get rid of that mat.
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