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Clear Coat Conundrum?

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  • Member since
    May 2020
Clear Coat Conundrum?
Posted by Rookie on Tuesday, May 12, 2020 8:40 AM

Hello;

I have been working on a 1/700 warship model and approaching its completion.  I just applied clear flat (Tamiya XF-86) with my airbrush.  Unfortunately, I ended up with some odd glossy blotches which has not happened to me before.

The question is do I do anything about this?  Should I try applying some more clear flat over the effected areas, do something else, or live with it and move on?

Any advice would be welcome.

Thanks.

  • Member since
    November 2018
Posted by oldermodelguy on Tuesday, May 12, 2020 3:25 PM

What did you thin it with and how much ? Are you sure those glossy patches are fully dry ? Answer these questions and we can go from there. I assume you're speaking mostly about the hull, is the base color gloss or flat paint ?

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Wednesday, May 13, 2020 1:37 PM

Is that one of the lacquer Tamiya paints?  The lacquer thinner evaporates so fast it actually cools the paint surface.  On humid days the paint surface can fall below the dew point, and water will condense on the surface, leaving a white coating.  Model airplane dope does the same thing.  Any time you are painting with a rapid drying solvent you must check the humidity.

 

Don Stauffer in Minnesota

  • Member since
    November 2018
Posted by oldermodelguy on Wednesday, May 13, 2020 2:58 PM

It's pretty fast drying acrylic that can be thinned with lacquer thinner ( basically hybrid acrylic lacquer as I understand it to be). Depending which lacquer thinner and if retarder was used or not it could act much like lacquer does in the right conditions.  Less fussy generally though.

  • Member since
    May 2020
Posted by Rookie on Monday, May 25, 2020 8:40 PM

I thined the Tamiya XF-86 clear flat acrylic with Testors Aztek acrylic thinner.  I didn't use much thinner howerver as XF-86 seems pretty thin already.

  • Member since
    May 2020
Posted by Rookie on Monday, May 25, 2020 8:42 PM

Don;

Tamiya XF-86 says it is an acrylic.

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Tuesday, May 26, 2020 8:17 AM

Rookie

Don;

Tamiya XF-86 says it is an acrylic.

 

There is such a thing as an acrylic lacquer.  I have heard that some of the Tamiya paints are acrylic laquer, that have a high vapor pressure thinner.

 

Don Stauffer in Minnesota

  • Member since
    April 2020
Posted by Eaglecash867 on Tuesday, May 26, 2020 8:31 AM

I've always used plain old 91% isopropyl alcohol to thin the Tamiya XF and X line of paints.

"You can have my illegal fireworks when you pry them from my cold, dead fingers...which are...over there somewhere."

  • Member since
    July 2018
  • From: The Deep Woods
Posted by Tickmagnet on Tuesday, May 26, 2020 8:38 AM

I thin XF-86 with Tamiya X20A and it works just fine everytime.

 

 

  • Member since
    May 2013
  • From: Indiana, USA
Posted by Greg on Tuesday, May 26, 2020 9:15 AM

Rookie
I thined the Tamiya XF-86 clear flat acrylic with Testors Aztek acrylic thinner.

Tamiya acrylic contains alcohol. Tamiya thinner X20A is basically isopropyl alchohol with a splash of retardant added, as I understand it.

So I'm agreeing with Eagle and Tick, and further see no reason why one might expect Testor's acrylic thinner to work. I've never used it for anything except Testor's/Model Master Acrylics, and never would. I'd strongly suspect it caused the unexpected results.

 

-Greg

  • Member since
    November 2018
Posted by oldermodelguy on Tuesday, May 26, 2020 6:26 PM

Rookie

I thined the Tamiya XF-86 clear flat acrylic with Testors Aztek acrylic thinner.  I didn't use much thinner howerver as XF-86 seems pretty thin already.

 

No, you want ipa, lacquer thinner or Tamiya X20A for that. I actually never thought of Aztek in Tamiya acrylic where the others work so well, I have some but never used it for that purpose. That said, I also can't say the Aztek is your problem either. I doubt I'll be running a test to find out what happens !

  • Member since
    May 2020
Posted by Rookie on Saturday, May 30, 2020 11:04 AM

OK.  Thanks to everyone.  I ordered some Tamiya X20A for future use.

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