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My paint scratches easily

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  • Member since
    January 2021
  • From: Somewhere near Chicago
My paint scratches easily
Posted by Teenage Modeler on Monday, June 14, 2021 12:44 PM

I painted this engine last year. Unfortunately, the paint peels easily. I add some pressure to my finger nail and then the paint scrathces, like this one:

Open Photo

Some information:

The paint I used (The black part) was Model Masters Semi Gloss Acrylic. I sprayed 3 light coats on it.

Just a side note, I did not clear coat this yet.

 

Am I doing something wrong? Is it about the paint? Should I add more coats, or spray some coats differently (wet coat)?

 

Or maybe it's the surface. Should I have primed the surface? Also, is this thing normal when it comes to paint in general, since it does not have a clear coat?

 

I would also like to add, how do I fix this? I do not want to start all over again. How do I fix it from scratching?

If only I could show my models to my friends...

 

 

  • Member since
    October 2019
  • From: New Braunfels, Texas
Posted by Tanker-Builder on Monday, June 14, 2021 12:52 PM

Aha!

      No I am not going to say IT! That would be cruel. This is why my class at the V.A. Rec.center in Martinez hated the stuff! We all had an Epiphany when four of the Six Baldwin Camaros, scratched easily.

 So I stripped every one of them and went outside the loading dock, one at a time and Sprayed them with Tamiya gloss Black Rattle-Can paint. Thank goodness no one had put Decals on yet! 

  • Member since
    April 2020
Posted by Eaglecash867 on Monday, June 14, 2021 1:05 PM

Primer is always a good idea, but the main problem is the paint itself.  Model Master Acryl paints are awful for adhesion and just about everything else they're supposed to do.

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

  • Member since
    July 2004
  • From: Sonora Desert
Posted by stikpusher on Monday, June 14, 2021 1:09 PM

It's the paint. Model Master acrylics have poor adhesion properties to bare plastic. And they are not too scratch resistant either. Combine the two and this is pretty common when using this type of paint. It's not you.

 

F is for FIRE, That burns down the whole town!

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    September 2012
Posted by GMorrison on Monday, June 14, 2021 1:34 PM

No amount of additional coats of any kind will increase adhesion of the first coat to the plastic. That first coat needs to really grab the surface of the plastic. 

I almost always use a primer. My current go-tos are either Tamiya white or gray in a spray can, or Badgers Stynylrez through the air brush.

Clean the part thoroughly after handling and before painting. Natural oils in our skin are disastrous to good adhesion.

 

Bill

 Modeling is an excuse to buy books.

 

  • Member since
    January 2021
  • From: Somewhere near Chicago
Posted by Teenage Modeler on Monday, June 14, 2021 2:09 PM

GMorrison

No amount of additional coats of any kind will increase adhesion of the first coat to the plastic. That first coat needs to really grab the surface of the plastic. 

I almost always use a primer. My current go-tos are either Tamiya white or gray in a spray can, or Badgers Stynylrez through the air brush.

Clean the part thoroughly after handling and before painting. Natural oils in our skin are disastrous to good adhesion.

 

Bill

 

Does that mean I have to strip the paint and add primer?

If only I could show my models to my friends...

 

 

  • Member since
    September 2012
Posted by GMorrison on Monday, June 14, 2021 2:37 PM

Either that, or touch up the scratch and then don't scratch it again.

 

Bill

 Modeling is an excuse to buy books.

 

  • Member since
    November 2018
Posted by oldermodelguy on Monday, June 14, 2021 2:43 PM

I use Stynylrez primer under MM Acryl and have had no problems with it scratching. It is entirely true that paint does not stick to bare plastic basically at all. But if you dig enough with your finger nails you eventually will scratch any paint. Not sure why you would do that other than in a test.

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