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Sheeting foam cores - 12/29/2002 11:09:12 PM   
Dennismate



Posts: 248
Joined: 12/6/2002
From: Epsom, UNITED KINGDOM
Status: offline 		What's the best adhesive to use to stick 1/16 balsa wing skins to foam cores?, and whats the best glue to use to stick the balsa sheets together in the first place?
       Post #: 1

Sheeting foam cores - 12/29/2002 11:57:11 PM   
GW



Posts: 540
Joined: 2/28/2002
From: Guntersville, AL, USA
Status: offline 		Elmers white glue for the wing joints. Used it for years.

Probond Ploy glue for the skinning. I have some stuff on my webpage about the skinning fo my Ricochet wing.

Using probond, if you just tape the seams together with a seamless joint there is really no reason to glue the sheets together. The probond will handle that for you. Works fine.


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Gerald "GW"

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Sheeting foam cores - 12/30/2002 12:21:54 AM   
Dennismate



Posts: 248
Joined: 12/6/2002
From: Epsom, UNITED KINGDOM
Status: offline 		Thanks for the info, not sure if Probond Poly is available here in the UK - what sort of glue is it?, contact advise, PVA...... Please let me know, it might be sold under a different name here.

Stuart

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       Post #: 3

Sheeting foam cores - 12/30/2002 6:39:09 AM   
MikeS


 

Posts: 219
Joined: 2/28/2002
From: Cincinnati, OH,
Status: offline 		Probond is a polyurethane glue that is activated by moisture and expands to several times its original volume. Under pressure, as in the wing cradle, it will expand into the foam and make a very strong bond. It fills gaps well, but do not let it escape, it sands terribly. There are several brands available around here. I remember seeing somewhere else that in the UK it may be sold as Excel glue or Gorilla glue (gorilla is also available in the states.
Try a google search, you should get a few hits.

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Mike

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Sheeting foam cores - 12/31/2002 1:20:13 AM   
Dennismate



Posts: 248
Joined: 12/6/2002
From: Epsom, UNITED KINGDOM
Status: offline 		Mike

Thanks for that.

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Sheeting foam cores - 12/31/2002 4:59:59 AM   
Vince


 

Posts: 1650
Joined: 2/2/2002
From: Nederland, Tx.
Status: offline 		Whatever you do, do not use 3M #77 spray adhesive. I am repairing the right inner wing panel of a G&P P38 that I bought at Bomber field in September. I discovered a soft spot under the sheeting and pulled off the sheeting to discover a melted area the size of a grapefruit. Yep the guy who started this plane used 3M #77, and it ate the foam. I never liked 3M #77 for sheeting wings, but I also never heard of it eating foam, that is until I read about it in this forum. Seems the new formula has a foam eating solvent in it, I could still smell it.

Vince

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Can't keep my mind from the circling sky.

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Sheeting foam cores - 12/31/2002 5:18:48 AM   
foxx


 

Posts: 594
Joined: 10/28/2002
From: Somewhere in the west, USA
Status: offline 		I agree with Vince about 3M-77 ,a lots of problem with this product the skin on my Zero started separating after a year. On the next plane I used Southern's Sorghum with great results here is link to give you some idea's

http://www.eam.net/DBROWN/bldsupplies.htm

If you decide to use S. sorghum make sure to seal the inside part of the skin with Balsarite or equivalent first otherwise a lots of sorghum will be absorbed by balsa.
the only disadvantage of sorghum is once the skin touches the core it is an instant bond and there is no moving around so measure and plan ahead. Good product. Next I have also used epoxy and it worked OK but the it is heavier than all methods

< Message edited by foxx -- Dec 31 2002 12:25AM >

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Sheeting foam cores - 12/31/2002 6:05:03 AM   
blvdbuzzard



Posts: 1571
Joined: 6/16/2002
From: boulevard, CA, USA
Status: offline 		In the olden days I used sourgum contact cement with really good results. It was cheap to get and lasted for ever on the shelf. Now I can not find it any more so I have used 3M-77(old), epoxy, alphetic resin powder you mix mith water, latex contact cement.

For the cost the latex wins hands down. It holds like crazy, does not soften in the heat, does not get brittle in the cold, does not eat foam, semi flexable so it bends a little instead of breaking. I picked up a quart for $8.00 at an apoulstery store. It does have a smell of amonia, but it goes away after ten minutes.

Gorillia glue works very well. Do not get ANY of it on the balsa. It does not sand woth beans. This also goes for the alphetic resin glue. It cures so hard it is not easy to sand. THe only problem I had with the OLD formula of 3M-77 was on real hot days the skins could begin lifting.

My opinion.

Dru.

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Sheeting foam cores - 12/31/2002 7:18:28 AM   
TerrellFlyer


 

Posts: 1631
Joined: 3/19/2002
From: Terrell, TX, USA
Status: offline 		I use thick CA to glue the skins together,then Z-poxy finishing resin,polyurethane glue,or slow epoxy in that order is my favorite glue,white or yellow glue works also.What ever glue you choose,use very little,after smearing the glue on the foam I then take a putty knife and remove the excess

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Sheeting foam cores - 12/31/2002 12:04:11 PM   
Bipe Flyer



Posts: 4983
Joined: 11/6/2002
From: Mission, BC, CANADA
Status: offline 		I used to use 3M 77, but after trying Pro Bond Polyurethane I'll never go back.

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       Post #: 10

Sheeting foam cores - 12/31/2002 12:17:02 PM   
Flyfalcons



Posts: 6248
Joined: 7/27/2002
From: Bonney Lake, WA, USA
Status: offline 		I use Foam Bond contact cement when I build my NWHT (all foam) planes. Works great, and I will not go to any other method to sheet foam after trying this method.


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Ryan Winslow

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Sheeting foam cores - 12/31/2002 6:53:40 PM   
Slug


 

Posts: 177
Joined: 12/23/2002
From: London, UNITED KINGDOM
Status: offline 		Stuart,

May be worth experimenting with 'Copydex' to stick balsa to foam.

Use it as a contact adhesive, ie coat both sides and let it dry clear, be warned as soon as you touch the two parts together, instand bond, no second chances!

Simon.

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       Post #: 12

Sheeting foam cores - 1/1/2003 11:11:20 PM   
Dennismate



Posts: 248
Joined: 12/6/2002
From: Epsom, UNITED KINGDOM
Status: offline 		Simon

Thanks for that, I'll give it a go.

Stuart

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       Post #: 13

Sheeting foam cores - 1/3/2003 1:37:37 AM   
FLYBOY



Posts: 8696
Joined: 1/7/2002
From: Missoula, MT, USA
Status: offline 		I use 3M transfer tape. Cover the entire surface with it, peel that backing and put on the sheeting. 3M 77 spray works well, just make sure you wear a good mask. That stuff is really bad for you. Very high cancer causing. For putting sheets together, I get cheap electrical tape at the outlet store, tape 2 sheets together on the seam, bend it back and put thick CA in the joint, then wipe the other side with a paper towel. Sand lightly as the glue is drying and the dust will fill the rest of any crack. Take the tape off and sand that side lightly and the crack there will be filled as well. You get nice smooth sheeting that way. Be carefull not to sand too much thinning the sheeting too much.

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Sheeting foam cores - 1/3/2003 3:19:44 AM   
ml3456-RCU


 

Posts: 558
Joined: 10/18/2002
From: Darien, IL, USA
Status: offline 		If you tape the skins together and let the probond hold it together, can the probond be sanded if any leaks out? How soft is it after it cures?

ML

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       Post #: 15

Sheeting foam cores - 1/3/2003 4:42:20 AM   
TerrellFlyer


 

Posts: 1631
Joined: 3/19/2002
From: Terrell, TX, USA
Status: offline 		Hi ml3456,poly is easier to sand than epoxy,the best way is as it goes through the cracks,wipe it off with a damp rag of water.

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Sheeting foam cores - 1/3/2003 5:01:54 AM   
ml3456-RCU


 

Posts: 558
Joined: 10/18/2002
From: Darien, IL, USA
Status: offline 		Thanks John,

Does it sand better than carpenters glue?

Mark

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Sheeting foam cores - 1/3/2003 5:08:03 AM   
TerrellFlyer