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Problem with Testors dull/gloss coat

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  • Member since
    August, 2004
  • From: Forest Hill, Maryland
Problem with Testors dull/gloss coat
Posted by cwalker3 on Tuesday, January 02, 2018 11:19 AM

I’ve used this product for years but have only had this problem on the past couple of projects. As I hope you can see on the attached picture, the finish comes out very uneven, with lots of what looks like little dots. I put the coating on in three thin coats. Any ideas on what’s going on?

  • Member since
    November, 2003
  • From: Newington CT
Posted by tempestjohnny on Tuesday, January 02, 2018 11:22 AM
Those dots are fisheyes. There must be some kind of contamination either in the bottle or on the surface. Anything oily will cause that

 

  • Member since
    March, 2013
Posted by patrick206 on Tuesday, January 02, 2018 12:56 PM

Agreed, those do look like "fish eyes." It's localized, as there appears none are on the fuselage. The contaminants can be a number of things, cleaner, oils from fingers when handling, etc.

Before painting I use a clean kitchen towel, (paper towel in the States,) and some alcohol, for a thorough wipe down of all the surfaces to be painted. A second towel and more alcohol is good insurance.

Probably could save it with some 91% and some good scrubbing to remove the paint, then have another go.

Patrick

  • Member since
    August, 2004
  • From: Forest Hill, Maryland
Posted by cwalker3 on Tuesday, January 02, 2018 3:16 PM

These didn’t show up in the paint, but in the gloss coat. The paint finish was nice and smooth.

  • Member since
    March, 2013
Posted by patrick206 on Tuesday, January 02, 2018 4:42 PM

Cwalker -

Understood, it's the clear that is the problem. But the contamination causing the fish eyes either settled on the previous paint coat, or is a contaminant within the clear finish. But since the fish eyes are localized, I would not suspect the clear bottle contents are affected.

The usual way for contamination of a surface, either bare or painted, is to have something airborne settle on it in the form of droplets or mist.

However it happened, it would seem that the color finish you applied somehow had something settle on it, prior to clear coat.  

  • Member since
    July, 2012
  • From: Douglas AZ
Posted by littletimmy on Tuesday, January 02, 2018 6:08 PM

Was there any moisture on the kit, or in the air?

I have seen high humidity do that. But this time of year, that's unlikely.

I have "wiped" down a kit with a damp paper towel, just after allowing the paint to dry, and just before applying the Gloss coat. And what you have there is "EXACTLY" what I got.

                      Dont worry about the thumbprint... paint it rust and call it "Battle damage" !

      

  • Member since
    June, 2010
Posted by 5-high on Tuesday, January 02, 2018 6:23 PM

I agree with pat ..somthing like grease from cooking .I.e   did somthing burn while cooking in the kitchen .or some kind of airborn mist ..ive had this problem happen to me ..while cleaning my airbrush.  The back flushing to close to my model caused a fine mist that got on the paint job. When I started painting the next round I got what you got ....ugh!!!Censored...FISHEYESBang Head.

  • Member since
    August, 2004
  • From: Forest Hill, Maryland
Posted by cwalker3 on Wednesday, January 03, 2018 6:34 AM

When i painted the model, I noticed the paint on the wings didn't seem to be coating as well as it was on the body. It's hard to describe but it looked like the paint was seperating from the thinner. I thought maybe the paint was too thin so I added a little paint to the mix when I shot the second coat. I didn't see the problem after the second coat. But then I put on the clear and the wings come out like they did.

Maybe there was some mold release chemical on it? But I didn't see the effect on the fuselage. And the problem didn't show itself after the second coat of paint, but it did when I put on the clear. And I've seen the same problem in my last two models. 

I'm going to see if I have some plastic sheet and try and replicate the issue with the paint. If I can, I'll post a pic of that. Thanks everyone.

  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Wednesday, January 03, 2018 9:19 AM

High humidity can be a problem with the lacquer clearcoats (or any lacquer finish).  What happens is that lacquer dries very fast, and dries by evaporation of the thinner.  This cools the surface and causes water to condense on surface.  But this usuallly causes a frosting of the surface, a white, somewhat rough surface.  The bumps and circles are almost microscopic, not the big blobs like in the picture of the original post.

Therefore I suspect the most likely cause is indeed contamination by an oily surface.  Still, when using lacquer clearcoats when it is very humid, be on guard for condensation.  This white, frosty disturbance of the painted surfaces is usually called blushing.

Don Stauffer in Minnesota

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