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Old 05-17-2009, 12:26 PM
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Why Did The Paint Do This?

Ok, I'm building my 352FE. I'm using Duplicolor engine paint. The brackets and some other stuff I've painted have been fine, including the aluminum intake. My brother even put one coat of paint on these valve covers fine, then we sanded them lightly, wiped them off with a rag and he put on another coat. He has a tendency to put it on too thick.

It turned all gray looking and it was almost like you could wipe it off. What the crap is the dealio? When we cleared the intake with Duplicolor engine clear, it kinda did the same thing.

When I painted the brackets it was fine, I'd paint 3-4 light coats with sanding in between and I had no problems.

Now it rained last night, not heavy, just a shower. Could the moisture in the air have caused this? Is it just a bad can of paint?

You can see on the right hand one, where he wiped it hard with the rag and it seemed to clear up. The longer they sat, the more gray it turned.


Here we just sat them on the engine to see how it'd look and you can really tell how off it is. The intake was painted with the same paint.


He painted the fan shortly after doing the valve covers and you can kinda tell how it's glossing over/graying in this pic. The fan however was bare, it hadn't had a previous coat of paint like the valve covers.



The only thing we can figure is the moisture in the air caused it. We also had a box fan going to circulate the air.
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Old 05-17-2009, 12:33 PM
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It has happened to me a time or two and it was the paint. Got a new can it did fine. Did you prep real well before painting ? Seen this cause it also.And yes this has happened to me before due to the weather. Cole

Last edited by eloc431962; 05-21-2009 at 07:49 PM.
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Old 05-17-2009, 12:57 PM
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Same prep we've been doing on everything else we painted. The engine is painted with Duplicolor engine paint as well. Some things have done fine, others haven't. The only real difference other than the weather has been the painter, haha, and size of the pieces. My brackets and stuff I did were fine.

I actually painted the fan once already, but being a dummy I grabbed it when it was wet and put some pretty deep finger prints in it we couldn't get sanded out, so he sand blasted the fan so we could re-do it. The valve covers were sand blasted, then he put one coat of the black paint on, we sanded lightly and then he put on a pretty heavy second coat and it did that glossing/graying over thing.
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Old 05-17-2009, 01:02 PM
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Rob Here




Hey BBB

IME weather plays a role in the painting.

I can make it rain just by shaking a rattle can .

To me it looks like one or any combination of:

~ Moisture {blushing}.

~ Too much clear most the time looks like a blush that clears up after its flashed.

~ Some dust got kicked up into the paint.

~ Some dust did not get "tacked off" after sanding.

~ Paint applied too dry. {dusting}
~~ Sometimes if you paint the other one in too close proximity of the other the over spray can get on your finished product.

Most of the time if the suns not shining real bright I use in fared lamps {heat lamps [like Micky D's]} to blow the moisture off the parts & bring them up to operating temperature.

Sometimes when spray bombing waiting too long or too short in between coats screws up the final result.

Squirt with thinner or paint remover & start all over .
Also like stated previously it is possible to get a "OFF " can 'O' paint,
I know I have.

Also I go for the finish coat with a new can because the spray patterns change from the start to finish of a can.


Good luck ,I Hope this helps



R
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Old 05-17-2009, 01:16 PM
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There's no clear on the valve covers or fan. Just the black.

The moisture and temperature sounds like probably what did it. It was like 10:30 last night and just after it had rained, it was kinda cool in the garage.

Thanks for the reply, Rob. My brother has a tendency to get impatient, hence the "I'll just shoot a little color to see how it'll look before we clean up."

I'll get onto him and make sure we do painting when it's warmer and drier outside.
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Old 05-17-2009, 01:17 PM
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The fact it was raining and likely moisture in the air, the fact that rattle can probably uses a fast solvent, it appeared to occur with two different things, your color and clear, and sounds like it turned a milky or hazy grey color, it does sound like blushing to me. If you have a heat gun or something, then try warming up the part a bit and see if it helps it disappear at all.
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Old 05-17-2009, 01:19 PM
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When it did it with the clear on the intake, he used his heat gun and it did eventually clear up.
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Old 05-17-2009, 01:23 PM
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Painting to late in the evening will cause it.temp changes. I'm sure the rain did't help any.
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Old 05-17-2009, 01:54 PM
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Get a couple of heat lamps . I use them on those clamp lights makes a big difference when spray bombing.

You can also set them out in the sun it would most likely clear up after sometime.

Yea I can understand ,you don't/ cant get into a hurry when painting.

Try Explaining it to him this way.

95% of painting is prep work. For the last 5% come out right{ the expensive part when using real paint} you got to get the 1st 95% right.

Oh Yea seems the best time to "rattle can " is right about noon , the sun is up the morning dew's burned off & the afternoon winds have yet to begun.




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Old 05-17-2009, 01:57 PM
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Oh yeah, definitely all in the prep. When I was wanting to get my Bronco painted, I talked to some guys and offered to get it sanded down and prepped and they wouldn't touch it unless they did it all -- which I most definitely could not afford.

Body/paint people are funny like that. If the final product looks bad, it makes them look bad. They're a very particular bunch about prep and how the paint is done.
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Old 05-17-2009, 02:12 PM
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And no disrespect to all HONORABLE Paint & body men,

Like Barry K .

Some have been painting too long with out a mask {if you know what I mean}

LOL
{not Barry }



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Old 05-21-2009, 06:59 PM
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moisture

when that happened to me, it was moisture (humid) and the reducer was too fast. I should have used a slower reducer. If you used a Rattle can to paint with it may be the same issue.
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Old 05-21-2009, 07:35 PM
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Looks like blushing to me too.. Retarder will fix it if you have to spray in humid condition's. .like south Bama.. Happens to me all the time. You can't add retarder to spray bombs so your screwed.
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Old 05-22-2009, 03:31 PM
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Not something you're used to seeing in Southern California but the weather did it. When you guys sprayed,the temperature was too close to dew point. The fast evaporating solvent in the rattle can paint pulled the surface temp below dew point as it evaporated, that condensed atmospheric water vapor onto and into the still wet paint. Nothing to do but strip and start over. There is poor surface adhesion because of this event, even if you can clear the color by heating, which sometimes works, the paint will fail quickly in service by flaking or peeling off the part.

Bogie
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Old 05-22-2009, 08:12 PM
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Thanks Bogie for that technical definition of events .

I understand it better now.




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