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Old Sep 28, 2012, 05:00 AM
stemo99 is offline
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What Glue For Dollar Tree Foam?


Got some Dollar Tree foam and want to know what glue to use on large areas to join together ie: KF airfoils, doubling fuselage etc. Foam safe and kicker too expensive, would titebond wood glue work ok? Is 3M spray adhesive used? Your help is appreciated. Thanks.
Steve
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Old Sep 28, 2012, 06:23 AM
EZglider is offline
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It's Just Foam!!!
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I use 3M 77 spray adhesive for laminating DTF. Works really well, but don't hold it too close. It will eat the foam a bit if you do. I just spray a couple of light coats, then press the surfaces together tight. I'll set some books, pots, whatever on top to for 15-30 min. to make sure the whole surface bonds well. Not sure if that's necessary, but it makes me feel better!
Old Sep 28, 2012, 10:39 AM
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I use gorilla wood glue for lamination without the paper. It works really well and cheap. I'm sure the titebond wood glue will be fine also.

EZglider, when you use 3M 77 is that with the paper off ? I tried it once (without paper) and it melted the foam so I never tired again. Maybe the trick is a VERY light spay.
Old Sep 28, 2012, 10:57 AM
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I use hot glue exstensively, it doesn't add alot of weight and very strong. Haven't tried anything else because of all the sucess with hot glue. I have built more than 30 planes out of $tree foamboard and crashed almost as many and the glue joints were not what failed.
Old Sep 28, 2012, 12:14 PM
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I use gorilla glue white for lamination as well as most other joints. Haven't tried yet, but Water based polyurethane varnish has been touted as a great laminating adhesive as it is less expensive then GG and doesn't foam. You will need weight to keep everything flat and aligned, though. Also, I think it cures overnight rather than in 10 minutes as does the GG. A std size (4oz?) bottle of white GG lasts me through 5 or so planes in the 30 to 35" span sizes.
Old Sep 28, 2012, 12:38 PM
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I too use hot glue and have never seen a failure. You just should work fast while the glue is hot.
Old Sep 28, 2012, 03:26 PM
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It's Just Foam!!!
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Don't think hot glue would work to laminate larger pieces, too much surface to cover. I've used GG also, just use an old credit card as a trowel to spread it really thin and even, then weight down overnight as Springer suggested. With the 3M spray, I do a light spray to each side, then wave it once or twice to evap any excess. Tjen just press together.I havent had a problem with excessive foam damage doong it this way. BTW, that is with paper off.
Old Sep 28, 2012, 03:35 PM
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"Fly, yes... Land, No"
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I use the elmers spray glue. I can get a nice big bottle of it from my local ACE for about $6-7. Ive had the 3M stuff melt the foam a little before, but I was useing an older can so it may have had a different mix in it then now. But I dont feel like spending $17 on the 3m stuff when the Elmers works great.
Old Sep 28, 2012, 04:22 PM
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Hot Glue, but can melt the foam if too hot.

White Gorilla Glue, downside is that it expands. It is a very strong bond and dries super hard which makes a bit hard to sand with the higher grit (120 +) sandpapers.

For a nice quick bond, light weight, clear and easy to work with...Fabri-Tac by Beacon. Can be found in the craft and fabric section at Wal-Mart. It bonds quickly with a pretty clean application, but note...if you use too much in a spot (big glob or puddle) it can eat at the foam. A nice, steady, reasonable bead will do no damage and offers a quick bond that is pretty strong.

I have never used it, but I have read of some using the Tite Bond glues as well.
Old Sep 29, 2012, 06:19 AM
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Thanks for the replies. I will do numerous test glue ups using all of the above suggestions and I'm sure I'll use several different types on the same model depending on what I'm securing. Thanks again.
Old Sep 29, 2012, 09:23 AM
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I have found that the 3M stuff will eat the foam I use Elmers multi-purpose spray adhesive. It has worked well for me. I think hot glue is way too heavy to use in fomie builds I only use it for servos and such. I have used hot glue for hinges before and it worked good. I guess it doesn't matter as long as it flys.
Old Sep 29, 2012, 09:46 AM
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I haven't tried DTF, but I have had success on some extruded polystyrene insulation with some 3M styrofoam/craft spray glue. Before that I tried 3M 77 but it ate away some of the foam I was test laminating. (I may have sprayed heavier than necessary, trying to get thorough coverage.)

I purchased this at a craft store:

http://www.amazon.com/3M-Styrofoam-S.../dp/B000KGAOAK

Charles
Old Sep 29, 2012, 10:02 AM
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hot glue works great for me. i use the small cheap gun from walmart, wont burn the foam but you should peel off the surface in certain spots beacuse the glue will pull it off if moved strongly like if a lipo slams forward. hope this helps. also its easy to remove just by running the gun tip over the old glue and you can wipe it up with a straight edge
.
Old Sep 29, 2012, 06:37 PM
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I have used finishing epoxy with great results. Air balloons can be added to keep weight down and make it a bit lighter. The epoxy also adds some rigidity that other glues don't.
Old Sep 29, 2012, 08:47 PM
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Hot Glue for Me Too.... I bought a lamp dimmer switch to regulate the glue temp, and it works great! I have one setting for pink foam that seems to legitimately "weld" the stuff together, and then I have a lighter setting for the EPS type foams.

Welds are super strong, so you dont need much. Remember, each stick of glue you use adds a stick's worth of weight.


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