Expanding Foam

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dmastachief

Jr Member

• Sep 25, 2009

• #1

im going to be making an ar and is great stuff what i use to fill it

 

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Namauri

Jr Member

• Sep 25, 2009

• #2

what product are you using can you link us please? because i have to pump out 4 guns by halo-ween lol

 

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GodlyCheeze

New Member

• Sep 25, 2009

• #3

I had this idea earlier, havent tested it though...

 

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ImaGonnaGetYou

Well-Known Member

• Sep 25, 2009

• #4

It could work in theory, but it's not a particularly effective idea. If you haven't used expanding foam before, I wouldn't recommend it.

 

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dmastachief

Jr Member

• Sep 25, 2009

• #5

no i mean i need to know if great stuff is what i use to fill the gun ive never done it before its called great stuff

 

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ImaGonnaGetYou

Well-Known Member

• Sep 25, 2009

• #6

dmastachief said:

no i mean i need to know if great stuff is what i use to fill the gun ive never done it before its called great stuff

Click to expand...

Most people use fiberglass resin to reinforce their props here. Great Stuff isn't what most people suggest, but I haven't used it with pepakura before, so I'll wait and see if anyone else has.

 

Last edited by a moderator: Jul 26, 2017

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GodlyCheeze

New Member

• Sep 25, 2009

• #7

Maybe try resining the outside. Then once its hard you can fill it with great stuff. That way it doesn't warp or anything.

 

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seaninja

Well-Known Member

• Sep 25, 2009

• #8

dmastachief said:

im going to be making an ar and is great stuff what i use to fill it

Click to expand...

NO!!!!!!!!!!!!!!... That is unless you resin the outside first. I used great stuff on my AR and well...

[attachment=12335:0925091547-01.jpg]

[attachment=12334:0925091547-00.jpg]

 

Last edited by a moderator: Jul 26, 2017

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dmastachief

Jr Member

• Sep 25, 2009

• #9

um it looks like giant turd and how would i fiberglass it fii i cant get inside it

 

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vector499

Jr Member

• Sep 25, 2009

• #10

seaninja951 said:

[attachment=12335:0925091547-01.jpg]

[attachment=12334:0925091547-00.jpg]

Click to expand...

oh lord that poor assault rifle looks like it got caught in a plasma beam

 

Last edited by a moderator: Jul 26, 2017

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seaninja

Well-Known Member

• Sep 25, 2009

• #11

Dusty said:

oh lord that poor assault rifle looks like it got caught in a plasma beam

Click to expand...

when I first posted this epic failure, everybody said that it looked like a battle damaged AR or BR. It turned into a win after those comments though.

um it looks like giant turd and how would i fiberglass it fii i cant get inside it

Click to expand...

I would resin the outside first and then use low expansion foam.Also, put holes in the AR so the foam can escape

 

Last edited by a moderator: Jul 26, 2017

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dmastachief

Jr Member

• Sep 25, 2009

• #12

ok but if i mess up how do i get fiberglass inside the gun

 

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ImaGonnaGetYou

Well-Known Member

• Sep 25, 2009

• #13

dmastachief said:

ok but if i mess up how do i get fiberglass inside the gun

Click to expand...

If you mess up, the AR will be ruined. Also, you can't fiberglass it once there's already foam inside.

 

Last edited by a moderator: Jul 26, 2017

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sporgo

Member

• Sep 25, 2009

• #14

Resin on the outside will help it keep its shape but that foam expands with great pressure and will still warp it if overfilled. Use only the minimally expanding foam meant for filling around windows. If you insist on doing it that way.

 

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jlhR2

Jr Member

• Sep 25, 2009

• #15

Where do you go to get expanding foam cheaply?



~James

 

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LT GRAVE

Member

• Sep 25, 2009

• #16

hey guys tried this a while ago. since its basically expanding glue it wont work.

in theory, if you do it like injection molding and have many point on where you will inject the foam. use low expansion and have other points where the excess can escape. its possible. b

but you wont be able to use it for mold making. only to stiffen the pep'd weapon.

i have used it on plastic airsoft shells and it has cracked some of them.

good luck guys

 

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GiR3892

Well-Known Member

• Oct 7, 2009

• #17

expanding will definitly work if you make "outlet" (say 4-6 , 3 each side) holes air can go inside and make it expand it would work better if you resined it maybe 3-4 times

or you could resin 1 or 2 times then cut in half CAREFULLY fiberglass it stick it back together then spray the expanding foam in the object j

 

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TyrDropProps

Member

• Oct 7, 2009

• #18

I'd suggest resining the outside and then applying a layer of clear packaging tape on every surface so it'll more or less hold the shape when the foam expands.

This is a similar way to Belakor's use of expanding foam in his various builds and it seems to work just fine.

 

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dmastachief

Jr Member

• Oct 7, 2009

• #19

ok cool be cause if i try to cut it in half id end up going off course and sawing my arm off

 

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Sniperbaas

Well-Known Member

• Oct 7, 2009

• #20

Step 1:

Resin the Outside of the piece

Step 2:

Cut the piece in Half or into small enough pieces to fill

Step 3:

ONLY FILL THE PIECE HALFWAY!!! or a little bit more

Step 4:

Trim extra great stuff

Step 5:

Reattach and Reresin the piece.



That's the only way I know of great stuff ever working in armor.





Cheers!