"flat" spots when using duplicolor metallic black lacquer?

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bennecc

New Member
I have been spraying several pieces using a duplicolor metallic black perfect match rattle can. I'm having trouble getting a nice smooth final coat on without getting these "flat" spots all over. Maybe this is what is called "blush"? (The majority of the coat is nice and glossy and shows a reflection, these spots are like a matte finish....dull with no shine whatsoever). The paint goes on fine, but about 30 seconds later as it dries the spots emerge.

My process is to get several coats of color on the part and let it dry. Then wetsand all the orange peel off until the part is smooth. The next day I clean it again, let it dry, then spray a final wet coat of color (the can is warmed with hot water for a better spray). But usually I get these flat spots. After several attempts at this I have gotten most of my parts done and they look good. I just tried finishing my last part and I got these spots again, so I'll be driving across town to get more sandpaper and another can of paint. FYI, the outside humidity was 40-45% when I sprayed.

Anyone know why this happens or how to prevent it?
 
dont mix paint... asking for trouble. search for the rattle can paint thread... lots of good info.
 
Rocan said:
dont mix paint... asking for trouble. search for the rattle can paint thread... lots of good info.
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d

You will be ok spraying Spraymax 2K over the laquer enamel, I have done it and turned out just fine.
 
rebellion ind said:
d

You will be ok spraying Spraymax 2K over the laquer enamel, I have done it and turned out just fine.
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As long as the lacquer is fully dry, can't remember the dry time on the duplicolor, but make sure is it not still off gassing and you will be ok.
 
Yep, good info here on cover coating with the spraymax 2K, make sure it is gassed out fully!

I think your flat spots may be overspray, that stuff is a bit different than emamel and is pretty thick. Once you have you paint on, just wet sand it all good with like 1500grit as a final or even 2000 grit. Clean it up and spray the clear, it will come back to a shine! Also once you have a couple coats of clear, wet sand it out to 2000 grit then clean, dry, and buff with a good light buffing compound and then wax....you should have show quality paint then.

Your humitity and paint temps sound right, not sure what the air temp is, but you should be fine. Thats why i think overspray is the culprit!
 
I think it was some combination of humidity, air temp, and dew point instead of overspray; I was careful to kind of spray away from the wet paint. I went back later in the afternoon when humidity was 30-35%, and before I sprayed I warmed the part for a few minutes in the sun. I put on one last wet coat and it turned out really nice.

One think I wish I had known before I started this rattle can job is that you can't sand the metallic paint bc it just gets dull. Maybe that's basic knowledge, but what can I say, I'm a beginner. Anyways, it just means you have to be able to lay that top coat perfect for a good result.
 
bennecc said:
One think I wish I had known before I started this rattle can job is that you can't sand the metallic paint bc it just gets dull. Maybe that's basic knowledge, but what can I say, I'm a beginner.
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Yes that's right. Just caught this thread, but you shouldn't wet sand metallics. If you do, you should give them a light coat afterwards. Then put your clear on as many time as you need, and wet sand to your hearts content.

Another piece of advice with metallics. Apply as dry coats only. Don't put it on thick enough to go 'wet' It will mess with the metallic effect. Leave all the glossiness to be handled by the clear coats you will apply later.

cheers
ian
 
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