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Need help with metallic paint pealing.

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  • Member since
    December 2005
  • From: Toronto, Canada
Need help with metallic paint pealing.
Posted by Stuart06 on Sunday, August 6, 2023 2:35 PM

I have painted my Arma Hobby K-84 with a metallic finish but seeing paint flake and pealling.  I want to redo this but was wondering the best way to fix this.  I am using Mr. Hobby Metallic paints as well as Mr. Hobby Super Metallic paint.  I have sealed it with AK Gauzy, but seeing some metallic paint peal, I did a second seal of Pledge Floor wax.  

If I were to just apply a primer over it would I still get pealling from underneath.  I will have to use tamiya tape to mask areas for different panel colors and other aircraft markings.

What you do you thing is the best route.

I thought about just doin the wings over (as that is most noticable) but not sure if I would get a weird look, or don't want the issue to continue.

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Most of my friends are imaginary

Sell your watch, because time is money $$

In Canada hwy speed is measured by number of moose tracks per hockey goal.

  • Member since
    July 2004
  • From: Sonora Desert
Posted by stikpusher on Sunday, August 6, 2023 5:10 PM

Peeling is probably due to poor adhesion by the paint to the bare plastic beneath. Your best bet is to strip off all of the metallic paint, use a good primer or base coat, and then apply your metallic top coat. On my last NMF build I used a Humbrol gloss enamel under the metallic coat, and it came out sweet. 


primed with gloss enamels

 

finished

 

 

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

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    December 2002
  • From: Northern California
Posted by jeaton01 on Sunday, August 6, 2023 10:27 PM

Best to start over with bare plastic when you are doing nmf.  I often just spray over bare plastic depending on the color and quality of the plastic, but if I want high shine I use a dark blue with a gloss finish under the nmf.  I don't like to wait for gloss enamel to dry so I either polish a flat blue, or put a gloss coat over it, once again Alclad Gloss.  I use Alclad paints, it may be that other paints have different adhesion qualities.

 

I am very lazy about cleaning plastic parts, just Windex usually unless I forget entirely but it is also possible that there was still mold release on your model where you had adhesion issues.

John

To see build logs for my models:  http://goldeneramodel.com/mymodels/mymodels.html

 

  • Member since
    November 2018
Posted by oldermodelguy on Monday, August 7, 2023 7:08 AM

My thought also is to strip it. If you're using Mr Color paints they are lacquer, so I personally would prime with their lacquer based Mr Primer Surfacer which I stock for my lacquer paint jobs only ( otherwise I use Stynylrez). Then base coat in something dark gloss or semigloss over that, others mention blue which may be ideal. Then your metallic coat. You have two choices: go this soup to nuts route or go to bare plastic, I've seen the Lacquers done either way, though while some folks feel lacquer bonds fine to plastic, to me it's always iffy to shoot color coats to bare plastic be they lacquer or not. As sometime the adhesion can be lost in spots a decade down the road.. But your plastic needs to be clean in any case anyway..

Windex may be fine as long as you use a scrubby or tooth brush then rinse real well. I've never tried it but it makes sense to me. The standard is a dish soap bath, usually a drop or two of Dawn in water. I also use mineral spirits. Your surfaces need to be free of stuff, even skin oils.

  • Member since
    October 2019
  • From: New Braunfels, Texas
Posted by Tanker-Builder on Monday, August 7, 2023 10:03 AM

Promise not to laugh or Get mad?

     When using Metalizer or Metallic paints, besides a high Quality Primer I wash the Model BEFORE, I put the Metallic coating on it or Just use different types of Foil chrome. I got tired of redoing Aircraft becuse of this Interminabley present problem.

  • Member since
    November 2018
Posted by oldermodelguy on Monday, August 7, 2023 1:37 PM

I know people do it but for me, I would have 0 interest in foiling an entire aircraft. Or much of anything else for that matter.

  • Member since
    September 2012
Posted by GMorrison on Monday, August 7, 2023 2:16 PM

There is no way to seal down a coat of paint that isn't adhering well. Best to start over. I prime with my supply of Testors square bottle gloss black. It takes about two weeks to harden.

 

Bill

 Modeling is an excuse to buy books.

 

  • Member since
    April 2020
Posted by Eaglecash867 on Monday, August 7, 2023 8:15 PM

I'm with everybody else on this.  Strip it to bare plastic and start over.  When I have to strip paint, I like to use 99% isopropyl alcohol and a cheap electric toothbrush.  The vibration of the electric toothbrush eliminates the need for you to do all of the scrubbing and also eliminates the large movements with a manual brush that can end up breaking things off of your model.  I wash all of my parts before priming with a soak in undilluted Simple Green (don't do this as an intermediate step if you have a painted/primed surface that you want to keep...Simple Green tends to start removing paint).  I then rinse the parts under hot water in a fine kitchen strainer (keeps even the smallest of parts from going down the drain) and give them a quick dunk in the 99% isopropyl alcohol before letting them air dry on a paper towel.  The dunk in the alcohol at the end just helps them dry faster.

I prime everything...even the smallest of parts...with decanted Tamiya Surface Primer, followed by a base coat of gloss black.  I have found Tamiya's LP-1 gloss black to be great for this.  It cures quickly, but not so quickly that you can't get an even gloss with it.  Then the different panels of Alclad go on.  I use Tamiya Masking Sticker Sheets to mask with.  Its adhesive qualities are difficult to explain.  It is infinitely "re-stickable" and grips the surface securely, while at the same time not being so aggressive that it damages things.

I used all of the above to paint the different panels on this F-4B stabilator, with no issues of metallic paint peeling off.  After everything was painted and discolored to my liking, I sealed everything with the AK Gauzy Shine Enhancer stuff.

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

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