Second coat of paint wrinkled help

[jskd82]

So I am painting some Hot Wheels and stripped them to bare metal and washed them in lacquer thinner before spraying.  I am using Krylon fusion spray paint.  I put the primer coat on then threw it in the dehydrator on 145*F for about hour and a half.  I Sprayed the first coat of paint then back in the dehydrator at 145*F for around hour and half.  I pulled it out and sprayed the second coat of paint which started to wrinkle within seconds.  What could be causing this?  Is it possible the body was too hot after pulling from the dehydrator that caused it to wrinkle?  It didn't do it between the first coat and primer so I'm not sure.  Can I just sand the wrinkles down and respray or do I need to strip it to bare metal again? 

 

Also instead of putting them in the dehydrator between coats should I instead just let them air dry for 15 minutes in between coats and then dehydrate?  Thanks!

[Fat Brian]

Krylon Fusion is tough stuff to work with. It etched a plastic body I used it on pretty severely. Usually when something wrinkles like that it's a paint incompatibility. The easiest thing to do is likely going to be find the color you want in a less volatile paint and start over again. Otherwise you can test whether it's better to recoat when the paint is not as set up.

[jskd82]

19 minutes ago, Fat Brian said:

Krylon Fusion is tough stuff to work with. It etched a plastic body I used it on pretty severely. Usually when something wrinkles like that it's a paint incompatibility. The easiest thing to do is likely going to be find the color you want in a less volatile paint and start over again. Otherwise you can test whether it's better to recoat when the paint is not as set up.

Thanks for the reply,  I have stripped it back to bare metal and am now trying to recoat as you said.   This is about the 3rd time I am retrying this lol,  the first try I did the coatings without letting them cure and it went great but when I dipped them in some dupli color clear coating it wrinkled bad.  So I figured I would try dehydrating them in between coats to see if that would help but then it wrinkled upon spraying the second coat.  I think my first attempt I didn't let it cure long enough, only a couple of days before dipping it into the clear coat.  My second attempt I'm quite sure it was due to the metal being too hot when paint went on, but not sure.  

 

I'm going to try to spray all the coats without it curing and then try to throw it into the dehydrator before dipping it into the clear again.

Edited February 11, 2022 by jskd82

[Ace-Garageguy]

Enamels and some other paints have a "recoat window" that's usually spelled out on the can.

Something like "spray additional coats within an hour or after 72 hours".

Sticking something in a dehydrator to try to force-dry it just isn't the same thing as giving the stuff the full recommended cure time.

What happens is that you flash dry the surface, but underneath is still gooey.

So when you hit it with new solvent-rich paint, the surface expands and swells over the gooey underlayer...and you get wrinkles.

I would bet this is what happened to you.

BUT...you can get away with what you tried with lacquer. 

My advice: ALWAYS READ AND FOLLOW THE INSTRUCTIONS, unless you do a LOT of trial-and-error testing on things you don't care about, so when things don't work, it's no big deal.

 

[Ace-Garageguy]

1 minute ago, jskd82 said:

I'm going to try to spray all the coats without it curing and then try to throw it into the dehydrator before dipping it into the clear again.

Really? You may as well pour paint stripper on it.

Duplicolor is lacquer. The solvent is hot and will almost certainly wrinkle or lift any non-lacquer paint you put it on.

And dipping it? Geez. 

[jskd82]

On 2/10/2022 at 2:08 PM, Ace-Garageguy said:

Doof

 

Edited February 12, 2022 by jskd82

[Miatatom]

Mixing different paints and clears is asking for problems. 

[1972coronet]

You mentioned that this is a Hot Wheels metal body. Are you using an etching primer or 'regular' primer? *That* could make a big difference. 

If you're not already using a self-etching primer (recommended over bare metal),  then you'll want to invest in an aerosol can of the stuff.

What scale is this Hot Wheels vehicle?

[jskd82]

4 hours ago, 1972coronet said:

You mentioned that this is a Hot Wheels metal body. Are you using an etching primer or 'regular' primer? *That* could make a big difference. 

If you're not already using a self-etching primer (recommended over bare metal),  then you'll want to invest in an aerosol can of the stuff.

What scale is this Hot Wheels vehicle?

Thanks, not sure if its etching primer, it just says automotive primer.  Hot Wheels are 1:64.