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Sky9pilot
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Stick & Tissue

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Re: Using foam in our models
Reply #8 - Oct 12th, 2019 at 9:59am
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I re-read Ian's post...that's a great point.  If the foam isn't sealed you can't be sure what the various finishing products will do to the foam.  That's why I highly suggest that the foam be sealed completely with something like yellow carpenter's glue thinned or something like that.  Most aerosol paint cans will attack the foam along with any acetone or laquer based products.  Once sealed, these other products can be applied with care over the sealed foam. Foam can be a modeler's real friend when it comes to all the "fiddly bits" that scale models seem to demand!
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Re: Using foam in our models
Reply #7 - Oct 12th, 2019 at 7:02am
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Thanks to all for the info, I think I know a little more now than before!

But, in acquiring this knowledge, I realized I may have missed the point. This isn't the "Make A Flying Model As Light As Possible" forum.

Not saying that this would be a bad thing, of course, but I realized that I needed to remember why I was here, and that was to rekindle the fun first seen as a boy. And so that's where I'll leave it. I might tinker around the edges but all said and done, it's all about stick and tissue. For me, at least!
  
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Re: Using foam in our models
Reply #6 - Oct 12th, 2019 at 6:55am
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Tom - Thanks for posting these items on foam and the ones regarding wheels clears up a lot of the mystery. I'm a big fan of Maxflyart on YouTube and watch how his foam wheels come out so well but could not understand the process leading up to the sanding of the wheel and how to get the hole in the center of the wooden plug. All clear now. I made balsa wheels for my Culver Dart and they were a bit clumsy so will give the foam a try. Thanks again.
Mike
  

"Skill comes by the constant repetition of familiar feats rather than by a few overbold attempts for which the performer is yet poorly prepared." Wilbur Wright
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Stick & Tissue

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Re: Using foam in our models
Reply #5 - Oct 11th, 2019 at 10:32am
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It's always a good idea to seal the foam with something.  I often use thinned yellow carpenter's glue.  I like it because it's sandable.  I use a thin first coat that usually brings out the grain/surface imperfections.  I then sand lightly with 320 then 400 to 600. Once I'm satisfied with the feel (an old autobody repair trick, hands are better than eyes when it comes to smoothness).  Another thin coat and 600 grit sanding.  From here I determine whether another coat is necessary to make sure that there is no foam showing through the sealer.  After this some modelers will apply a layer of tissue over the finished foam piece.  Due to the color of the foam you may want to treat the finished product with a light coat of acrylic paint (that won't attack the foam) to match the color of the balsa so the finished tissue won't show the foam as a different color. 
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Re: Using foam in our models
Reply #4 - Oct 11th, 2019 at 7:38am
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AK - Any building supply center, Lowes, etc. It's in the insulation section of the building dept. I get blue foam from Lowes.
Mike
  

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Re: Using foam in our models
Reply #3 - Oct 10th, 2019 at 2:07pm
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OK, where do I get this stuff?
  
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Re: Using foam in our models
Reply #2 - Oct 10th, 2019 at 1:33pm
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Just a note. Before using your foam in the model, try your finishing technique on the foam to be sure that it won't become dissolved or misshapen when it is too late to correct it. I was hoping to use a bit of foam in my last project, but the Krylon made it shrink, so I abandoned that idea.

ian
  
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Re: Using foam in our models
Reply #1 - Oct 10th, 2019 at 11:58am
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Many thanks to Tom for starting this topic. I'm thinking about a foam fuselage for my next project but have zero experience with the stuff. So, if you have tips or techniques particularly valuable to a first timer, please post them here!
  
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Using foam in our models
Oct 10th, 2019 at 11:03am
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As noted in the heading...FAC restricts the use of foam to the smaller components of a build; such as wheels, scoops, machine gun covers, fairings, tail cones, etc.  I have noticed that some of the builders on HPA are building fuselages and whole models from foam.  I'll post a few articles that I have found from various sources such as newsletters and forums for "How To's" for making the various components. 
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Foam_WheelsMaking.pdf ( 1083 KB | 70 Downloads )
FoamMakingThings.pdf ( 99 KB | 68 Downloads )
FoamSlicer.pdf ( 269 KB | 62 Downloads )
FoamWheelsDowelCenter.pdf ( 66 KB | 59 Downloads )

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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