Weldbond vs. Canopy glue - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-22-2005, 01:15 AM   #1
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Weldbond vs. Canopy glue

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I am doing some window work and thought I would share a little experiment I did. I used canopy glue to secure some windows I am installing and I then used some Weldbond for another job in the shop, both glues were used of of the same pallet but they did not touch each other. The Canopy glued did dry clear and remain flexible as advertised. However the Weldbond did exactly the same thing. The glue pallet is visible in the picture below and it is one of the old windows I am replacing. The glue spots on the old window are beside the bottle they came from, the Weldbond on the left and Canopy glue on the right. I have bent the old window in every direction right were the glue spots are and they both performed exactly the same no cracking or discoloration. They also did not seperate from the window despite being bent so much the window almost creased. Now the Canopy glue cost me $5.49 for 59ml and the Weldbond cost me $4.99 for 227ml. I know which one I will buy in the future.
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Old 06-22-2005, 04:38 AM   #2
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I've been using Weldbond for years.I've almost given up using CA as I'm not in a rush but as to using it for canopy's I've been using Epoxy but on the new one I'll try it.Thanks John
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Old 06-22-2005, 07:37 AM   #3
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Another good one to use for canopies is GOOP Automotive. It comes in clear and black.

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Old 06-22-2005, 11:43 AM   #4
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I swear that the RC56 (and new Pacer 56 glue) IS the same PVA adhesive as Weldbond. Weldbond has been around for years (since the 60's?) and is definitely a polyvinyl type glue, but it adheres to most plastics much better than a modern woodworking PVA adhesive. I use both extensively in my business.

I certainly buy the weldbond, its like you said much less $$.
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Old 06-23-2005, 03:25 AM   #5
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i use weldbond all the way....hold everything alot better , in certain areas i use epoxy , the 2 part tubes that ya mix,,, i use epoxy mostly on and around my engine mounts along with bolts....i just made a boat stand for my miss budweiser boat and only used weldbond....stronger i believe then ca thick or thin....my 2 cents are now in
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Old 06-23-2005, 11:12 AM   #6
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With the flexibility of Weldbond after it has cured I would think that it would help limit the damage after a small mishap as it would allow the airframe to flex evry so slightly, were as a brittle glue would just crack. I am becoming a Weldbond convert.

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Old 06-24-2005, 05:26 PM   #7
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Weldbond is good stuff, but not that great. At least not from my experience.

The only caveat to using weldbond for a canopy or any exterior gluing application is that it is not waterproof. I used weldbond in the last repair of my Kougar to seal off the canopy and for the covering ends at the firewall. The fuel residue doesn't seem to bother it, but water does.

The weather hasn't been the best around here lately so I have had to go at it "die-hard" style. When flying out in light drizzle rain I notice the weldbond around the canopy going from clear to white again. Meaning the water is softening the glue. The bottom perimeter of my black canopy turns white. . When back in the shop, it dries and goes clear again overnight. This is not from flying in heavy rain, just mist/light rain/ heavy dew type conditions.

It is great stuff, but do not use it on your canopy. The best canopy glue to stick anything to everything is GOOP. GOOP does stand up to fuel and is waterproof. GOOP is the best multi material glue available to us for our modeling needs. Use it.

Except for my electric foam planes, I no longer use weldbond on any part of my models. I use epoxy, CA, GOOP, and Pro-Bond wood glue only.
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