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Old 11-26-2010, 11:36 PM   #1
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glueing coroplast

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This winter I thought I would try building a SPAD. They look like a blast and I have an abundance of parts since my two planes met untimely ends. I am having trouble getting the coroplast to glue though. I flashed it like the videos say (even practiced it like they suggested) when I tried to glue a few peices for practice they would not stick-at all (just a drop of CA every half inch or so) I know the CA is good because it sticks the balsa of the Space Walker kit I'm working on like crazy. What am I doing wrong?

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Old 11-26-2010, 11:44 PM   #2
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Re: glueing coroplast


In my experience CA does not work on coro. I use "Automotive Goop" from Canadian Tire or similar. It takes a while to dry but sticks well & does not need any "flashing."

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Old 11-27-2010, 07:04 AM   #3
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Re: glueing coroplast

I've also had bad luck using CA on coro. To get it to work, i've clamped the pieces together for the evening.
My favorite to use is contact cement. I have some stuff from a spray can for doing countertops that works very well. But the LePage stufff in a can works as well. Also, goop, gorilla glue, heck even poking some holes in the coro and using zip ties holds it together!!
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Old 11-27-2010, 07:06 AM   #4
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Re: glueing coroplast

I used CA before after a bit of prep. There seems to be a mold or extrusion release layer that needs to be removed before the CA will bond. As a final prep I wipe with methanol.

A couple of pointers that may be of importance. First is that CA need airborne moisture to set properly. Same with moisture contained within wood or porous plastics. With low moisture content in closed and heated homes in the winter this tends to slow it down. Obviously a non porous material like Coro will not contribute much and the surface prep described earlier likely removed any minor amount that could have been there.

Second point I found is that Coro does not fare well in colder temps. It becomes extremely brittle and is pretty much destroyed in a minor impact. Hinges also become very stiff and likely to crack.
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Old 11-27-2010, 08:17 AM   #5
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Re: glueing coroplast

I've built at least half a dozen coro combat planes. Sand the coro joints and use medium CA to hold it together. You will also likely need to use a kicker to get the CA to set and bond to the coro. Then use a Polyurethane glue like " Gorilla " or " Elmers Ultimate " to do the final bonding. The coro needs to be sanded before you try to glue it. We also use a woodpecker to put small holes in the coro if we are bonding large flat surfaces. To join 2 flat pieces I coat one with the glue and then lightly spray the other with water. Put them together and tack with CA, Then use a weight to hold them together till the glue sets. Poyurethane is an excellent glue for foam as well. It expands as it cures so you need to hold pieces together until the glue has set.
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Old 11-27-2010, 09:24 AM   #6
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Re: glueing coroplast

Go to the website in my signature. In the downloads section you'll find a document where I compiled 4-5 pages of ways to glue coro from the original spadder forum. It's a few years old but is still valid.

BTW, my personal way is to rub it with a cloth (till my arms are sore) with alcohol, flash it, woodpecker the coro, sand it, ca it, pull it apart, sand it then use gorilla or polyurethane glue. Clamp it every time with short length of 2x4 and C-clamps.

Keep in mind, some colours glue better than others.
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Old 11-28-2010, 09:05 AM   #7
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Re: glueing coroplast

Thanks for the advice, I am going to use a combo of flash, sand, woodpecker, gorilla glue and clamp. Overkill maybe but this is all an experiment anyway lol.

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Old 11-28-2010, 04:59 PM   #8
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Re: glueing coroplast

I have built many SPADs, lots of different sizes. I have used CA (but no longer do so), contact cement (works well, especially like the water-based stuff), polyurethane glue (Elmers Ultimate, overall the best adhesion for my needs), and even hot melt (least satisfactory, but ok for a quick fixup).

I do not "flash" the coro. I clean it with acetone on a cloth or paper towel, that's all. In some cases, where I am very critical, such as the joining of wing trailing edge and ailerons, after initial cleaning with acetone, I rub the contact area with a Scotchbrite pad, or steel wool, or very fine sandpaper (or my chin, if I haven't shaved that day). Then I again rub it down with acetone on a rag or paper towel. Of course, the acetone is what you use to get rid of those annoying political slogans and mugshots which always seem to be on the "free" coroplast that litters the countryside right around election day. Gotta love democracy!
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Old 11-29-2010, 12:05 PM   #9
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Re: glueing coroplast

I find that the different colors of coro I am using sometimes require different glues/techniques to achieve a good bond so I usually do a bond & pull test first to determine which to use. I have been using Medium CA, Goop (Household & Marine), Gorilla or Elmer's Polyurethane and I flash, lightly sand or scotchbrite, and find that using rubbing alcohol works well to rub it down with.

Most times I find I am using CA for Coro to Coro, Goop and Poly for LE dowels and spars. For CA - I use fresh CA (keep in fridge!) and mist one surface lightly with water.

With the Poly glue using the "woodpecker" technique (again lightly mist one suface with water) on coro works well. I also use this glue for beefing up the area where control horns are to be mounted, squeeze in some glue, or push some in with a skewer, a little mist of water, then I tape over the edges and it expands to stiffen these areas up without adding much weight, you can squeeze this into the screw holes and tape over them when the horn is mid-span as well. I also us it with Bamboo skewers to stiffen up control sufaces.

I clamp for all these glues using a 4 foot level, clamping every 8 to 10 inches as I know the edge of my level is true and flat. 30 minutes for CA, 2 hours for Goop or Poly are the minimum times I use and have had good results.
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Old 11-29-2010, 10:29 PM   #10
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Re: glueing coroplast

I've been using contact cement for a wile now, like the other posts, I have tried CA, Goop, Spray Adhesive, and found contact cement is the cheapest and easy to use. First I sand with 80 or 100 grit sandpaper, then I use thinner to clean the coro and contact cement together.
It must work ok, last combat this season I had 4 mid airs in the SAME FLIGHT with 4 other planes....yep took 'em all out of the sky and kept on flying! and they say I fly "aggressive"...whatever that means??

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Last edited by canadianf1pilot; 11-29-2010 at 10:36 PM.
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