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Old 04-05-2016, 07:03 AM
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Paint reaction, what did I do wrong??

Hi all!

These are the steps I did till now ( in this order) :

Sand the car back to bare metal
Panel work
Weld
fill any low spots
etch primer
2K high build primer cured for 24H
sealer cured for 4h

Silver metallic base, and this is where I have a problem.
My paint seems to react, not everywhere though.
Does anyone have any ideas why? And what to do..
The only way it doesn't react is if I spray it very VERY dry ( 1 turn out on the fluid screw) . ANy help would be much appreciated!

THanks!



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Old 04-05-2016, 08:38 AM
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What products are you using? Did you sand the primer? What sealer? How was it applied? Pictures are not always easy to see the exact result. Some of it looks like lifting, other areas look like cracking. So I am not sure exactly what you have there. The base should go on more like medium/wet coats. If you are getting this reaction right away, I would say you have lifting - a chemical reaction. My guess is the sealer is not liking the base - was it catalyzed?
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Old 04-05-2016, 08:42 AM
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Hi!
Thanks for the reply!
Its more crackeling. It reminds me of what I saw when i sprayed laqcuer over cellulose a long time ago.
I sanded the primer, did not sand the sealer. Sealer was indeed catalised. Should it need to cure for longer?
Thanks
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Old 04-05-2016, 09:23 AM
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The substrate was too thin, be it the sealer or the primer, or not fully cured. That is all there is to it, it's "lifting" because the solvents from the paint got under it buy going through it.

If it was applied too wet the curing is slowed.

Brian
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Old 04-05-2016, 09:43 AM
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Hi!
How would I cure this? Lots of small/thin coats?
Or sand back and reprime?
Thanks!
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Old 04-05-2016, 10:53 AM
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Removing it and starting over is the right way. You can cheat something like this by applying the color very dry. I have shot paint over something very sensitive by applying VERY light coats, I mean spraying so dry and light that it takes 10 coats to cover, and waiting a 5-20 minutes between those coats. It is amazing what you can do if you do this so that the solvents can't soak into that substrate. I tell you this mostly so you understand a little about what has happened. But really, removing that and doing it properly from the get go is the right way. Make sure each product has full film thickness and make sure it is flashed properly between coats so it fully cures.

Brian
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Old 04-06-2016, 01:03 AM
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Thanks!

Its back in primer now :p
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Old 04-06-2016, 10:18 AM
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Be sure it's proper film thickness throughout and fully cured. Often problems happen when someone sprays "three coats" as should be (this can be different depending on the product, I am using 3 as an example) and they think it's covered. But if it's not sprayed evenly over the whole surface an area may not be covered!

Here is a "Basics of Basics" on what I am talking about. Spraying Technique - Autobodystore

Brian
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Old 04-07-2016, 07:00 AM
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What did you thin the paint with?
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Old 04-13-2016, 02:18 AM
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Quote:
Originally Posted by deadbodyman View Post
What did you thin the paint with?
Paint was thinned with "D-thinner"

Bought one of those " 3 litre kits" , so everything should've been compatible ( all bought from specialistpaints)

Its all painted now, and I want to thank you all for your help







Quite happy with it
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Old 04-13-2016, 06:52 AM
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Great color, glad you got it worked out.
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Old 04-13-2016, 10:09 AM
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Awesome color choice! I love those little cars.

Brian
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