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Making Replacement Windows?

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  • Member since
    April, 2015
Making Replacement Windows?
Posted by Mopar Madness on Saturday, June 08, 2019 8:58 PM

Hello friends.  I posted this in the scratchbuilding section but I’m not sure how much traffic that forum gets so I thought I would post it here to make sure I get some suggestions.  Working on an Airfix Ka-25 Hormone and the windows from the kit have sink marks in them as shown below. I tried to make a replacement window on a test mule with scotch tape and epoxy. I taped one side and put clear 2-part epoxy on the other side. But the window came out cloudy and with air bubbles as shown. Any suggestions? Or, does anybody have any other ideas for making good replacement windows?

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

  • Member since
    May, 2011
  • From: Honolulu, Hawaii
Posted by Real G on Saturday, June 08, 2019 9:22 PM

I think you are on the right track.  Try again, but use gap filler CA glue.  Pour slowly and tease out air bubbles with a pin.  After the CA sets, sand and polish inside and out.  Don’t forget to pre-paint the window openings.

  • Member since
    January, 2009
  • From: hamburg michigan
Posted by fermis on Saturday, June 08, 2019 9:37 PM

The couple times I've ran into this issue...I cut masks, using the kit parts and set them aside, first. Then, "thermo-formed" clear palstic over the fuselage near where the window should be (to get the rounded shape). I cut out a square/rectangle, a bit bigger than the window itself, in the fuselage. Cut the clear part to fit the bigger square. Glue into place, and place mask where window should be. Being bigger, the edges can be cleaned up nicely, without messing up what you want to be clear.

GAF
  • Member since
    June, 2012
  • From: Anniston, AL
Posted by GAF on Saturday, June 08, 2019 10:56 PM

If the "thermo-formed" plastic doesn't work, you might try just using some clear, plastic bottles to cut windows out of (such as soda bottles).  I used an empty mouth-wash bottle recently to cut out windows for a spacecraft model.  You might luck out and find one with exactly the curvature you need.  You can cut this stuff with scissors and sand it to shape, so it's very versatile.  Good luck with whatever method you use!

Gary

  • Member since
    December, 2002
  • From: Northern California
Posted by jeaton01 on Saturday, June 08, 2019 11:19 PM

I would use plastic from a CD case, that is about as clear plastic gets and it polishes well, too.  As Fermis said, cut the hole larger so you can put in a larger than necessary piece of clear, let it stick above the plastic surface, and sand and polish to conform to the skin.  Mask to the size of the window and paint.

I have used clear epoxy on small windows with good results but you do have to be careful to not entrain air.  I apply the epoxy just like white glue, with a toothpick and work from the outside in.  I put in the epoxy from inside the window and just let it sag outside.  If not enough epoxy is applied the first time you can add more in layers and it will not be visible.  It takes awhile to harden, (as much as a week) but when it is cured it can be sanded back to conform to the outside skin. I did the windows on my DH-125 with this method.

 

John

To see build logs of my models, go here: http://goldeneramodel.com/mymodels/mymodels.htm

  

  • Member since
    April, 2015
Posted by Mopar Madness on Sunday, June 09, 2019 9:28 AM

Thank you everyone!!

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

  • Member since
    April, 2015
Posted by Wolfman_63 on Sunday, June 09, 2019 2:11 PM

I went to an office supply store and bought a box of cheap document covers. These are made of clear acetate similar to the transparency sheets they use to use for overhead projectors. It is thin, clear, flexible, bendable, Easy to trim/cut, and does not fog up with CA glues. I use them in place of the clear side windows on aircraft even if the kit windows are fine. It was $6.00 for a box of 25. About 200 models worth of suppy. LOL

Website:

David's Scale Models - https://www.davidsscalemodels.com

 

 

 

 

 

  • Member since
    April, 2015
Posted by Mopar Madness on Sunday, June 09, 2019 3:54 PM

I tried the CA method last night but the window frosted over.  I might have to give the clear acetate a go. 

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

  • Member since
    April, 2015
Posted by Mopar Madness on Sunday, June 09, 2019 3:56 PM

jeaton01

I would use plastic from a CD case, that is about as clear plastic gets and it polishes well, too.  As Fermis said, cut the hole larger so you can put in a larger than necessary piece of clear, let it stick above the plastic surface, and sand and polish to conform to the skin.  Mask to the size of the window and paint.

I have used clear epoxy on small windows with good results but you do have to be careful to not entrain air.  I apply the epoxy just like white glue, with a toothpick and work from the outside in.  I put in the epoxy from inside the window and just let it sag outside.  If not enough epoxy is applied the first time you can add more in layers and it will not be visible.  It takes awhile to harden, (as much as a week) but when it is cured it can be sanded back to conform to the outside skin. I did the windows on my DH-125 with this method.

 

 

I may try the epoxy again. I like your suggestion about not using tape but just letting it sag and then sanding it back after a completely cured.

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

  • Member since
    April, 2019
Posted by John 3:16 KJV on Sunday, June 09, 2019 6:24 PM

I just recently got a glue for clear parts (pic below):

On the back, it has directions for making windows (pic below, I added highlights):

 

 

     ”For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 

     For God sent not his Son into the world to condemn the world; but that the world through him might be saved.“

                                          - John 3:16-17

  • Member since
    March, 2008
Posted by Caveman on Sunday, June 09, 2019 8:33 PM

I have had some success using white glue in the manner described.  But only with fairly small windows or lights.  Larger windows have always sagged on me.

 

  • Member since
    April, 2015
Posted by Mopar Madness on Sunday, June 09, 2019 8:58 PM

Thanks guys! The windows are only 1/4” x 1/4” so I might give it a shot. 

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

  • Member since
    April, 2019
Posted by John 3:16 KJV on Sunday, June 09, 2019 9:10 PM

You’re welcome. If you go through with it, please show pics of how it turns out!:)

 

     ”For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 

     For God sent not his Son into the world to condemn the world; but that the world through him might be saved.“

                                          - John 3:16-17

  • Member since
    April, 2015
Posted by Mopar Madness on Sunday, June 09, 2019 9:21 PM

I just laid down a coat of Microscale Kleer, basically the same thing. I’ll let you know how it turns out.

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

  • Member since
    April, 2019
Posted by John 3:16 KJV on Tuesday, June 11, 2019 9:37 AM
Thanks, Mopar! :)

 

     ”For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 

     For God sent not his Son into the world to condemn the world; but that the world through him might be saved.“

                                          - John 3:16-17

  • Member since
    April, 2015
Posted by Mopar Madness on Sunday, June 16, 2019 8:11 PM

So after trying out a few materials, it looks like the Micro Krystal Kleer will be my best option.  I’m pleasantly surprised.

Chad

God, Family, Models...

At the plate: 1/48 ICM Fw 126

On deck: 1/72 Airfix Lightning

In the hole: 1/72 Airfix Hunting Percival 

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