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Foams and Glues

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Tim Mackey26/02/2010 16:00:37
20920 forum posts
304 photos
15 articles
A couple of useful links

1) EPS = Expanded Poly Styrene. Usually white, and rather fragile in density - like the old ceiling tiles material. Very light weight, and sticks well with PVA, UHU Por, or even hot glue guns with care.

If other peeps would care to add more foam types below, that would be great

Edited By Tim Mackey - Administrator on 15/06/2010 23:46:51

Phil Wood.15/06/2010 23:45:19
3638 forum posts
27 photos
EPS can also be Extruded PolyStyrene.......Often called "Blue Foam" it comes in a variety of colours ...."pinky orange" if you get it from B&Q as floor insulation.
It's more dense than Expanded PS but can be sanded and shaped.
I suggest epoxy for use on this stuff.
EPP......Expanded Polypropylene........This is Correx with a load of air bubbles......normaly available in two densities and two colours.....white or black......the black is the more dense.
This stuff is super tough and often used in the car industry for shock absorbent can even stand the odd clash with Timbo............Although some contact adhesives say not to use on Polypropylene, I've found the instructions on Evo Stick Impact Adhesive don't mention it.......and it works great.
Mark R16/06/2010 04:43:05
279 forum posts
44 photos
Excellent ...cheers for that Tim n Phil.....and also anyone else who adds to the data base
Tim Mackey16/06/2010 10:33:28
20920 forum posts
304 photos
15 articles
Come on you foamie fans, lets add to the database here.
Depron. Correx. EPO. Elapor and so on.......wheres foamie Dave when you need him LOL
Bob Cotsford16/06/2010 12:37:29
8382 forum posts
463 photos
I've used Evostick for hinging on small EPP models - just chamfer the hingelines, run a thin bead of Evo along each edge and allow to dry as normal, then line up and press the hinge together - hey presto - instant hinge!
Depron repairs - I've used greenhouse tape ( a thick clear tape that feels slightly rubbery to the touch) to repair tears and creases in models, in fact my Wildfire is probably 30% tape by now.
Terence Lynock02/01/2011 16:23:30
2453 forum posts
46 photos
Took two blocks of foam, one Dow blue and the other B&Q pink, both blocks identical size = 48 cu in.
The blue weighed in exactly 5 grams heavier than the pink, there was no appreciable difference in the cutting times etc, the pink appears to be softer and sands to shapeeasier,it is more easily damaged though.
 Blue is also stiffer for a given thickness.
Unless your making a big wing where weight is a critical factor I would go with blue, by the time you have coated pink it will weigh about the same anyway.
So, you pays your money and takes your chance with these two,
Tom Wright 226/01/2011 23:40:02
3908 forum posts
297 photos
I have just test flown my own design 10ft span blue foam EP rc model .I used 3M77
spray UHUpor epoxy and aliphatic,it all hangs together very well,see the model flying
on u tube by searching for TOMS BLUE MONSTER.
JOHN THOMPSON 527/01/2011 00:06:01
62 forum posts
I designed and built a mid wing sports plane , all out of depron , but entirely held together with Fablon, covered all the surfaces , hinges , the lot, the key is to run a medium hot iron over the fablon,to stick it down properly , BEWARE though once ironed its on for good , just as well cos it makes the depron bomb proof.
DogFlight05/07/2012 00:12:42
6 forum posts

I'm building an F-117 using black foamboard and don't want to fork out for a hot-melt glue gun. What glue should I use? I have tried UHU POR on some test pieces, it bonds well to the foam core but not to the card outer.


Cyclicscooby05/07/2012 12:32:47
874 forum posts
531 photos

@Ashley - Try foam-safe CA as this will soak into the cardboard..


I've only used 'Depron' for my builds, mainly cuz it's all thats available at my LMS...

The EPP stuff (looks like old-skool polystyrene) is OK on a pre-made RTF, but not nice to work with.. Too brittle, too crumbly..

Not used Blue foam..

Re Glue.. I use Foam-2-Foam (Like UHU Por) for big bits, and a foam-safe CA for fixing and small bits...

Out of curiosity, I have tested Z-epoxy, and Zap Pink n Green CA's, which immediately melted the foam.. Z-Epoxy was a suprise..!! Also found out the hard way,that CA REMOVER can also melt foam, even if the CA is safe...

PVA works, as in, it doesn't melt it, but it doesn't adhere well to smooth foam..

I've found FibreGlass tape (I think thats whats it's called) useful for placing over the glued in CF spars, just to smooth things out.. Could also work on a LE..

As a cheap alternative to glass cloth, I have tissued one model, and coated it in foam safe dope. Not rock-hard, but certainly more ding-proof.. On a side nore, DONT try tissuing a flat sheet wing, as the shrinking tissue tends to warp the sheet... Trust me.. !! Since found foam-safe spray paint..

My hack, a 150W 6mm depron profile Edge, is now over 12 months old (feels like 3yrs..! )

It's on Mk2 landing gear, but hanging together well.... I've learnt and tested everything on it, including constant landings on a very rough gravel drive. It's just starting to 'micro' crack round the stress points, and requiring the odd bit of CA to fill them, so there's gonna be a day when it's too knackered, but for a £10 airframe, im not complaining..



Chrisie.. xx

Edited By Cyclicscooby on 05/07/2012 12:34:04

Chuck Plains17/11/2012 22:21:28
1096 forum posts
244 photos

I'm attempting to make as near as I can an indestructible plane for me to learn the inscrutible flying art.

My fuselage is carved from a block of EPE (expanded polyethylene) that I scrounged from the packing area at work (yes I did ask first). This stuff is stupidly durable! You can jump up and down on it! A few of the bubbles migh burst, but it will mostly retain it's original shape. And an RC plane won't suffer that sort of stress, not even with me crashing it!.

I've been using hot glue on it and it's as if I have welded it together. Super strong! I tried UHU POR, wet and tacky/dry methods and could pull the join apart two days later. It's not light weight, but I have cut out the fuse from the underside. A carbon spine of some kind will be required as the flex is hilarious, but it's all part of the deal

Chuck Plains15/08/2016 08:30:44
1096 forum posts
244 photos
LOL !!
Foam and Glues has been made a sticky !!!!! :D :D :D
Capt Kremen04/11/2016 07:39:12
349 forum posts
144 photos

With the mess that HK have made of their web site, which of the multitude of glues available do folk use on Multiplex Elapor?

I have used CA in the past including the MPX own brand glue it really irritates nose and throat despite being used outdoors. UHU POR or similar is not strong enough for securing the carbon rod wing reinforcements and things like horns.

YakMad04/11/2016 09:27:10
518 forum posts

I've used CA but more recently I have been using the Foam-Cure EPP EPO glue and the Clear Foam Glue (Mucilage) which do appear to give a stronger bond then CA.


Chuck Plains05/11/2016 21:26:05
1096 forum posts
244 photos
Posted by Capt Kremen on 04/11/2016 07:39:12:

With the mess that HK have made of their web site, which of the multitude of glues available do folk use on Multiplex Elapor?

I have used CA in the past including the MPX own brand glue it really irritates nose and throat despite being used outdoors. UHU POR or similar is not strong enough for securing the carbon rod wing reinforcements and things like horns.

Not forgetting that we need to wipe any surfaces to be glued with a bit of meths first. I would use carpenter's foaming polyurethane type glues for anything bigger than a control horn. I'm currently using one called Geocel Joiner's Mate that I got from Screwfix. A 500ml bottle costs around £9.50, so it's cheaper that Gorilla Glue and does not expand more than about 100%. Gorilla expands about 500%. Apart from that, any foam safe CA I guess, but I've used Roket Odourless CA almost exclusively, it's relatively expensive, (8.99 from my LMS) but has a 20 second setting time which is very useful. I've always used Bob Smith Industries Foam Safe activator on it. But you can, allegedly, accelerate it with moisture.

Yah, UHU POR is garbage, I find it too flexible and too expensive as a result.

I have used some Maplin Electronics Spray Adhesive. It's cheap and foam safe but remains flexible.

Stephen Jones06/11/2016 11:48:18
2805 forum posts
1614 photos


UHU POR is a great glue for depron type foam and i use it almost exclusively their are alternative at craft shops.

Which are also made by UHU,

UHU Creativ Foam Rubber - 33ml,

And UHU Creativ Poly&Foil - 33ml,

Yes it does seem to be a high price but remember that this is a specialist glue and you only need a very thin coat.

And Does get stronger over time.


Stephen Jones06/11/2016 12:01:20
2805 forum posts
1614 photos


I print out my plans and then spray mount them onto my wood or foam using 3M Craftmount for easy cutting out of parts i then peel of the paper, this also seems to be expensive but again only a light dusting is all that is needed.

Do any of you guys know if Bostik Fast-Tak is a good alternative.


Stephen Jones20/12/2016 22:25:10
2805 forum posts
1614 photos


I can confirm that Bostik Fast-Tak is a good alternative to 3M Craftmount.


Geo.15/07/2017 15:57:03
24 forum posts

Hi hope this is the correct place.

Just got myself an E-flite carbon Z cub and have a question about gluing on the rudder hinges.

What sort of glue would you recommend for this carbon Z foam ?. The manual does not say, only that damage can be repaired with various glues including regular CA. Never having a foam model before I not sure, does regular CA not eat away this type of foam ?

Thanks in advance for your help.

Chuck Plains26/07/2017 22:45:22
1096 forum posts
244 photos

HI Geo,

Have the hinges come off? Or are you just reinforcing them from new? Whatever the reason, you'll need a foam safe glue. UhU POR or UhU Creative should be fine. Always test a tiny bit of the glue adhesive somewhere inconspicuous, like inside the fuselage.

If the hinge is detached, I would use a thin bead of UHU along both pieces right at the join, allowed to dry, then slide the pieces together with both parts resting on a flat piece of cardboard/balsa/ply/whatever, that way you have the best chance of good alignment. If you mess up, just cut it away and start again. ;¬

Hot glue would also work. For that, I would assemble the hinge with masking tape on one side, then pivot the hinge open a little, towards the masking taped side, run a quick bead of hot glue n there and, before the glue hardens, wipe most of it away with the corner of a piece of scrap foam.

You can see the method at 7:10 in this video

Hope that helps.

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