SEARCH FINESCALE.COM

Enter keywords or a search phrase below:

Varnish left white residue

631 views
14 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    May, 2017
Varnish left white residue
Posted by Thedazza on Wednesday, August 16, 2017 1:11 PM

Hi, I recently completed my 1:35 scale willy's jeep and decided to clear coat with humbrol acrylic varnish, my Base coats were all tamiya acrylics, so I am a bit confused why I have a white residue all over my model, any ideas or help would be greatly appreciated Darren 

The dazza

 

  • Member since
    January, 2013
Posted by BlackSheepTwoOneFour on Wednesday, August 16, 2017 1:56 PM

Did you stir it before airbrushing?

  • Member since
    May, 2017
Posted by Thedazza on Wednesday, August 16, 2017 3:07 PM

It was an aerosol, first time I've used it, wish I had used my tamiya flat clear

The dazza

 

  • Member since
    May, 2013
  • From: Indiana, USA
Posted by Greg on Wednesday, August 16, 2017 5:10 PM

My guess is you sprayed from too far away, and the paint partially dried in the air.

I think it's happened to most of us. It has to me.

I have a FW-109 in my case with a milky-white matte finish to remind me of the mistake.

You should be able to fix it with a semi-matte or gloss varnish right over the top. That was Stik's advice to me years back and it's worked every time for me. Just spray it heavy and close, keep the can moving. Or use an airbrush if you can.

-Greg

  • Member since
    May, 2017
Posted by Thedazza on Thursday, August 17, 2017 1:54 AM

Thanks Greg, appreciate your help, I think I will stick to the airbrush from now on, and will try to give it another coat 

The dazza

 

  • Member since
    March, 2017
Posted by Lord Voyager on Thursday, August 17, 2017 7:06 AM

I have a trick for you. I use the spray varnishes all the time and a legendary car painter taught me that if you take a large container of hot tap water (I use a big bucket) and let the rattle can sit in there for 15 minutes, dry off the can and nozzle and then shake it for 5 minutes the contents will be perfect for spraying. I do this every time and its never failed me.

The paint and carrier in the can gets smoother and atomizes better when its warm. Hot tap water is not enough to cause unexpected explosions (unlike throwing rattle cans in a fire or microwave) so you're safe there. 

"The Grid. A digital frontier. I tried to picture clusters of information as they moved through the computer. What do they like? Ships, motorcycles. Were the circuits like freeways? I kept dreaming of a world I thought I’d never see. And then, one day… I got in.

  • Member since
    January, 2013
Posted by BlackSheepTwoOneFour on Thursday, August 17, 2017 8:28 AM

Lord Voyager

I have a trick for you. I use the spray varnishes all the time and a legendary car painter taught me that if you take a large container of hot tap water (I use a big bucket) and let the rattle can sit in there for 15 minutes, dry off the can and nozzle and then shake it for 5 minutes the contents will be perfect for spraying. I do this every time and its never failed me.

The paint and carrier in the can gets smoother and atomizes better when its warm. Hot tap water is not enough to cause unexpected explosions (unlike throwing rattle cans in a fire or microwave) so you're safe there. 

 

 

 

That is the oldest trick in the book. I used to do this during the 80s. I've never heard of anyone sticking a rattle can spray paint in the microwave or fire to warm it up.

  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Thursday, August 17, 2017 8:40 AM

Acrylic varnish is not true, old fashioned varnish.  It is quick drying, whatever solvent they use, and therefore may be susceptible to blushing in high humidity.  Blushing occurs when you have a high dewpoint (humidity).  The rapid evaporation of the solvent cools the surface below the dewpoint causes water to condense on the surface with microscopic roughness that appears white.  Try sanding with very fine sandpaper, such as 1000 grit, and coat again when it is very dry weather.

 

Don Stauffer in Minnesota

  • Member since
    November, 2008
  • From: Florida
Posted by plasticjunkie on Thursday, August 17, 2017 9:13 AM

The milky MM clear acrylic flat is another product that does that to me every time, leaving a whitish dusty effect so I stay away from it.

Spray gloss lacquer to restore the finish then shoot some Testor's clear flat lacquer for a dead on flat finish.

  • Member since
    May, 2017
Posted by Thedazza on Thursday, August 17, 2017 2:49 PM

Ok thanks for the advice 

The dazza

 

  • Member since
    May, 2017
Posted by Thedazza on Thursday, August 17, 2017 2:50 PM

Wow, that's something I've learned, cheers 

The dazza

 

  • Member since
    July, 2013
Posted by modelmaker66 on Friday, August 18, 2017 11:10 PM

Don Stauffer

Acrylic varnish is not true, old fashioned varnish.  It is quick drying, whatever solvent they use, and therefore may be susceptible to blushing in high humidity.  Blushing occurs when you have a high dewpoint (humidity).  The rapid evaporation of the solvent cools the surface below the dewpoint causes water to condense on the surface with microscopic roughness that appears white.  Try sanding with very fine sandpaper, such as 1000 grit, and coat again when it is very dry weather.

 

 

That is one of the most useful bits of information I have ever come across here. Thank you for posting that Don!

  • Member since
    May, 2017
Posted by Thedazza on Saturday, August 19, 2017 2:36 AM

Yes thanks Don, people like you with your experience,  keep teaching us novices, 

The dazza

 

  • Member since
    May, 2017
Posted by Thedazza on Saturday, August 19, 2017 2:44 AM
Hi Don, would you please add me as a friend, as I have forgotten how to thank you

The dazza

 

  • Member since
    January, 2014
Posted by Silver on Tuesday, August 22, 2017 11:39 AM

If using a spray can.Shake very well after letting the can ln warm water for about 10 min.

JOIN OUR COMMUNITY!

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

SEARCH FORUMS

SUBSCRIBER-ONLY CONTENT
FREE NEWSLETTER