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Can't polish Humbrol Metal Cote

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  • Member since
    January, 2017
Can't polish Humbrol Metal Cote
Posted by Hawkboy71 on Sunday, February 05, 2017 6:35 PM

Doing some tests on a spare F-86 fuselage with Humbrol Metal Cote before I tackle my Mig-15 model.  I got it all sprayed up and for some reason it won't really polish.  Some parts polished up great after only a minute or two of polishing while others remain somewhat gritty and hazy...

Here's a nice shiny bit on top of the fuselage (It buffed up after a minute with some paper towel)...

And here is a grainy bit that won't polish up that much (After a LOT of polishing with a cloth, Buffing stick, Paper towel)

Any ideas???

 I should add I'm NOT air brushing but using a spray can from Humbrol.

Thanks guys!

  • Member since
    July, 2004
  • From: Sunny So. Cal... The OC
Posted by stikpusher on Sunday, February 05, 2017 9:11 PM

A big part of the battle with metallic paints is surface prep. Did you prep the basic surface at all?

 

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

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    January, 2017
Posted by Hawkboy71 on Sunday, February 05, 2017 9:33 PM

Ahhhh see I only primed it (I had read many people suggest gloss black, truth be told it didn't look all that glossy when I sprayed it).  What did I miss?  Lots I'm sure! Wink I'm so glad I'm experimenting first.  Even unpolished this spray looks more metallic than the regular silver I used on my Original F-86 kit so I'm heading in the right direction.  So glad to be back into this hobby. 

  • Member since
    July, 2004
  • From: Sunny So. Cal... The OC
Posted by stikpusher on Sunday, February 05, 2017 10:20 PM

You want the underlying surface to be as smooth and shiny as possible. I can't speak for the gloss black primer, but just polishing the basic plastic before the metalcote is applied will give you much better results.

 

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

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    January, 2017
Posted by Hawkboy71 on Monday, February 06, 2017 11:14 PM

I'm on it!  I've got a few spare kits around I'm testing on so I will definately do what you say.

I was thinking would using the spray in really cold weather cause that grainy surface?  I did the test outside on my deck in -8 degree celcius weather.  I will certainly try the next bit in my garage to see if there is a difference.

  • Member since
    January, 2017
Posted by Hawkboy71 on Monday, February 06, 2017 11:31 PM

So I just did two pieces... one outside in the cold on my deck and one in my garage.  The Deck sprayed the same grainy texture...  the Garage was smooth and buffed up with 30 seconds of rubbing!  I'm just guessing, but I think the cold air may have been the culprit?  Plus I washed and buffed the pieces before spraying.

Who knows... but I think I'm ready to bring on that Mig!  Thanks again!

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