SEARCH SCALEAUTOMAG.COM

Enter keywords or a search phrase below:

paint cracking

706 views
6 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    May 2020
paint cracking
Posted by umpire93 on Thursday, June 4, 2020 7:26 AM

i painted a hood and when it dried the paint was all cracked. i guess you call this crazing. how do you fix this?  thank-you

  • Member since
    December 2003
  • From: Nova Scotia
Posted by Bainford on Thursday, June 4, 2020 10:45 AM

By the sounds of it, it's not crazing. Crazing ocurs when the plastic surface is attacked and damaged by a hot paint, such as a strong lacquer.

We need more info to diagnose this problem. What kind of paint? What was your process? Did you use primer, and what kind? Using an airbrush or spray can? Have you applied more than one coat? If so, how long between coats, and what kinds of paint were used? A photo would help, too.

The problem could be due to a number of causes. Sometimes applying a second coat outside of the 're-coating window' can cause this. Most paints have a period of time after application when it is acceptable to apply a second coat, maybe 2-4 hours or so, but it varies depending on the individual paint. If you are too late, then you must wait until the paint has fully cured, which could be days.

Applying a clear coat or a second paint coat of a type that differs from the base coat can cause issues. Some paint types are not compatible with each other. Many do play well together, but some don't get along, such as applying a lacquer over enamel, which can cause big problems.

Just a couple thoughts, there. Give us a little more info on your paint process and products used to see if we can narrow it down.

"It would be unusual, if the unusual didn't occur."

- Steamboat Gariepy

Trevor

  • Member since
    May 2020
Posted by umpire93 on Thursday, June 4, 2020 8:19 PM

i used rust-oleum painters touch ultra 2x primer.  i got busy with other things.  i painted the the body and hood about 2 weeks later with homedepot colorshot acrylic spray paint. only the hood paint paint cracked. the body came out fine.  is there a way to fix the hood?  i have used the colorshot for other models and not have a problem.  maybe it was i warmed up the can first under hot water and then painted the hood then the body

  • Member since
    January 2017
Posted by 195X on Thursday, June 4, 2020 9:50 PM

No, your problem isn't the Colorshot, it's the Rustoleum. that paint doesn't play well with others. Whenever using a rustoleum product be sure everything else matches. Meaning, if you use RO primer, use the same brand for color and clear. You can get away with using the RO primer or paints with different brands but, it amounts to setting it aside and forgetting it for at least a month. Then do your scuff work and you should be okay. For some reason their primer is hot and gases out like old style Testors enamel.

As for fixing it you can strip the hood with a number of products. I prefer easy off uncented, extra strength. It'll strip chrome in 2.5 minutes. Then I would go back to HD and nab a compatible primer for the paint you're using. I think you'll be safer that way unless you don't mind the wait for it to gas out. A month may be exaggerating but, it does take the long way.

My favorite color is clear. I am also ambidexterous, I can screw up equally well with either hand. I am 53 years old and been building for most of that time. :)

On the bench... somewhere. Pink Panther show car, 1978 Dodge Magnum Charger Daytona Midnight edition SE 300. Mongrel T.

  • Member since
    May 2020
Posted by umpire93 on Thursday, June 4, 2020 10:21 PM

if i am using colorshot spray paint you are saying that i should use colorshot primer.  not tamiya or anything else right?

  • Member since
    January 2017
Posted by 195X on Friday, June 5, 2020 11:07 AM

Yes.

My favorite color is clear. I am also ambidexterous, I can screw up equally well with either hand. I am 53 years old and been building for most of that time. :)

On the bench... somewhere. Pink Panther show car, 1978 Dodge Magnum Charger Daytona Midnight edition SE 300. Mongrel T.

  • Member since
    February 2020
Posted by Painted Black on Friday, June 5, 2020 11:33 AM

Four days ago, I primed a 60 Chevy truck with this primer, RO 2x grey 

And then this morning I sprayed the first color coat with this, RO 2x Almond gloss.

It looks like a river bottom that hasn.t seen water in six months... IT CRACKED with just the first mist coat. But, since I.m doing a weathered paint job, I couldn.t have asked for a cooler result.!!

Point is.... ALWAYS test, even with the same brands.

JOIN OUR COMMUNITY!

Our community is FREE to join. To participate you must either login or register for an account.

SEARCH FORUMS

FREE MONTHLY NEWSLETTER
By signing up you may also receive reader surveys and occasional special offers. We do not sell, rent or trade our email lists. View our privacy policy