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Old 11-16-2008, 03:23 PM   #11
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Re: What glue for coroplast?

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Originally Posted by redvan View Post
Do you have to flash the coro with a torch before using gorilla or CA?
the usual response is yes. There is a knack to it so practice on scrap first.
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Old 11-16-2008, 03:33 PM   #12
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Re: What glue for coroplast?

Agreed, flash if you want. Just give it a good sanding, I guess what I meet was kicker, apply Med CA then kick it, For some reason you get a better bond when you use kicker, I think it may have something to do with it heating up.

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Old 11-16-2008, 03:40 PM   #13
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Re: What glue for coroplast?

I almost always 'woodpecker' my coro. The PU glue will foam up into the holes for a very tight bond.

I have stopped flashing and cleaning with alcohol/paint thinner, and just woodpecker, sand, and use PU glue.

Again, 8 hours can be a bit of a wait though.
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Old 11-16-2008, 03:54 PM   #14
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Re: What glue for coroplast?

It's funny everyone has their own method. I personally don't flash and use med CA. Back in the day when I used to flash I was building a model and forgot to flash a few joints. They turned out to be the best joints I had ever done. No more flashing after that. I probably did not do it correctly. I think it depends on the coro and what they use to release it from the mould. I've also tried Gorilla glue and I hate it! I may try it again someday and woodpecker my coro.

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Old 11-16-2008, 04:30 PM   #15
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Re: What glue for coroplast?

Wow! 2 pages of reply in one day!
Lots of things to try out, thanks everybody. I asked a long time ago
the signmaker of my wife for the exact stuff he was using but all I got was
a vague 'rtv silicone' answer, he was probably scared I'd start fixing signs
for people..... I'll try a few test pieces.

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Old 11-18-2008, 07:40 AM   #16
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Re: What glue for coroplast?

I borrowed a heavy duty stapler from work one weekend, they kind that will stable 50+ sheets of paper. The idea was to staple the trailing edge of wings with it. To keep the coro from crushing, I shimmed the stapler to limit it arm's closing.

More research is needed and alas, I no longer have access to the stapler. I thinking that combined with a staple gun, you could probably build an airplane in under an hour.
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Old 11-30-2008, 12:23 PM   #17
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Re: What glue for coroplast?

I have built several SPAD Debonairs and Das Plas Sticks and I have always only used Medium CA glue.

I give the seams a 1/2 overlap then I use 100 grit sandpaper and give the seams a good scraping on both sides of the joint. Then, what I feel really helps is to wipe the glue areas with Acetone. I then take a sharp point and poke holes all down the areas to be glued. I never use a full bead of ca, (this is KEY to getting a proper glue joint) just little dotts about every 1/4". Put the seams together and weight them down or clamp them for approx 1/2 hour and you have a seam that will be very very difficult to ever pull apart.

I have sold approx 4 Spads to guys in my club and they are still flying them after 3 full seasons with absolutely NO hint of the seams seperating. It might sound like a long process but actually it goes very fast. I can build a complete 60" wing in less than 1 hour using this method including the drying time!

4mm coro for the bottom of the wing with ailerons attatched and 2mm coro for the top of the wing. A 60" wing needs to be built in two halves and joined at the centre with a 5" piece of 4mm coro wrapped around from top and accross the bottom of the wing. I cut 5/16" strips of pine from a clear piece of 2" X 4" for the spars and use the same proceedure to tack glue them in place with the Medium C/A.

I fly my SPAD Debonair 60" span using a Thunder Tiger 46 Pro 2 stroke engine and let me tell you, I really hork it around and it take a tremendous amout of abuse. Have never had a wing come apart....NEVER!
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Last edited by Gary Maker; 11-30-2008 at 12:26 PM.
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Old 11-30-2008, 12:57 PM   #18
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Re: What glue for coroplast?

H.D. staples were also one of the suggested methods. Put some thin ply between the pieces to give the staples something to bite in to (as well as preventing crush). Just at the staple point, not the whole length.

What's the worst that could happen? It's fun seeing how they come down when trying to fly on one wing
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Old 12-18-2008, 08:42 PM   #19
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Re: What glue for coroplast?

My vote for Med CA
Clean with windex flash with propane torch and small dot of med CA every 1/4 inch

Bonne chance!!!
Coro Fly like Balsa... But it crash so much better!!!

Last edited by lecrote; 12-18-2008 at 08:45 PM.
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Old 12-19-2008, 09:28 AM   #20
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Re: What glue for coroplast?

You guys have all obviously never used contact cement. We have built literally dozens of spads, so I can attest to this.

It is the best bar none for spar to coro joints, and on flat surface to surface coro joints such as ailerons, wing trailing edges, fuse doublers. Simply lightly scuff the surface with 220 sandpaper, apply two coats to each surface, let dry and press them together. I've never had a joint fail, and it has just enough flexibility to give in an impact instead of cracking.

Having said that, PU and CA glue both have there uses with coro.

PU, with the addition of 1 drop of water per ounce, is excellent for bedding 4-40 rod in coro flutes, and also, it is exclellent for brushing on the inside of a rounded fuselage to stiffen and reinforce the coro.
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