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Issue with Alclad...

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  • Member since
    June 2017
  • From: Winter Park, FL
Issue with Alclad...
Posted by fotofrank on Tuesday, November 19, 2019 2:46 PM

Just finished a 1/72 Hasegawa T-37B. I finished the airplane like the T-37's when I was at Moody back in the 60's. That would be NMF. This is the second airplane I've had issues with Alclad. I did everything by the book. After filling and sanding, I polished everything to a glass-like shine. No scratches to be found. Before primer I cleaned the model with 50% isopropyl alcohol. Then I shot Alclad Gloss Black Primer. I let it sit for a day to be sure the primer cured completely. Next I shot Alclad Aluminum, misting on a couple of coats with good coverage. No black primer showed through the Aluminum. Again I let the model sit over night to be sure the Aluminum paint was cured. Then I sealed it with Tamiya Gloss thinned 1/1. When I was doing decals I noticed blisters in the paint at corners and mated edges. After decals I sprayed with Alclad Semi Matte to seal the paint and decals. Now the paint on the model's painted surfaces are cracked in many places. I'm at a loss. I bought a couple colors of AK Xtreme Metal last Saturday. It's an enamel paint, a paint I'm more familiar with. The next NMF model I do will be painted with that paint. I hope for better results.

OK. On the bench:

Way too much to build in one lifetime...

  • Member since
    December 2002
  • From: Bury St Edmunds, Suffolk, England
Posted by Bish on Tuesday, November 19, 2019 2:59 PM

frank, i wounder if its the Tamiya clear coat. You should not need to seal the paint Alclad before adding decals, you can apply them straight to the Alclad.

''I am a Norfolk man and i glory in being so''

On the bench: Dragon 1/35th Tiger I/AMT STAP with Battle Droid

  • Member since
    September 2012
Posted by GMorrison on Tuesday, November 19, 2019 4:11 PM

I do not know the answer although I've had versions of that problem too, without the Tamiya clear. 

In my opinion your dry times are really short. I typically go at least three to four days, sometimes so long that I forget about the model.

My only two bits to add here.

  • Member since
    June 2017
  • From: Winter Park, FL
Posted by fotofrank on Tuesday, November 19, 2019 4:26 PM

Thanks, Bish and GM. Other than the curing time I'm concerned about the paint blistering. The cracked paint along the canopy was a blister that flaked away showing the primer. In the third picture you can see blistering where the tail wing joins the vertical tail. It is a befuddlement as the king would say.

Bish, the only reason I clear coat the Alclad is so I don't rub the paint off the leading and trailing edges of the wings. That happened with an LT-6G I built a couple of years ago.

OK. On the bench:

Way too much to build in one lifetime...

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Wednesday, November 20, 2019 8:37 AM

I never overcoat my Alclad finishes.  As someone mentioned above, decals go down fine on Alclad.  I haven't noticed bubbles or cracks with trying an overcoat, but I feel overcoats do alter the sheen of the Alclad.

With any unusual paints such as Alclad or any nmf finish, I do a lot of testing.  The popular test subject in this area seems to be plastic spoons.  Many of our club show-and-tells are from folks with their test spoons showing off their latest new paint tests.

 

Don Stauffer in Minnesota

  • Member since
    June 2017
  • From: Winter Park, FL
Posted by fotofrank on Wednesday, November 20, 2019 9:35 AM

Thanks, Don. When you shoot Alclad, how long do you let the paint cure before you do the decals?

OK. On the bench:

Way too much to build in one lifetime...

  • Member since
    June 2014
  • From: New Braunfels , Texas
Posted by Tanker - Builder on Wednesday, November 20, 2019 11:30 AM

Hi;

         I would give it four or five days in the dryer box. I don't know what Don will say though. Personally I will not use any of the sprayable metal finishes on aircraft. 

    I still foil them. T.B.

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Thursday, November 21, 2019 10:23 AM

fotofrank

Thanks, Don. When you shoot Alclad, how long do you let the paint cure before you do the decals?

 

I only let it set for four or five hours- never had a problem.

 

Don Stauffer in Minnesota

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