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  #1  
Old 01-23-2023, 09:03 AM
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Default R/C airplane foam wing contact cement ?

Hello all.
Years ago Sig used to sell Core-Bond, Kwik-Bond, and Foam-Bond contact cements for bonding Balsa or 1/64 Plywood skins to foam wing cores. They all contained Perchloroethlyene as the solvent carrier so as to not attack the foam. Regular Contact Cement won't work due to usually having a solvent package similar to dope thinner.
None of those exist any longer.

Does anyone know of a Contact Cement that now exists that is foam-core compatible ?

Before anyone asks, NO, I do not want to use Epoxy or Foam-Compatible CA.
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Old 01-23-2023, 11:39 AM
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When I built the Stratoblaster (my only foam core/balsa skin plane), either the instructions or the gurus on R.M.R. said to use 3M 77. It worked fine, but that was in the mid 90's. IIRC, I read in forums not to use it anymore, that the formula had changed. I don't recall if it was because it would no longer hold or if it started attacking foam. Maybe someone has started making a spray adhesive that will work again.
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Old 01-23-2023, 02:32 PM
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Yeah, 3M 77 USED to be okay until they reformulated the solvent package to one that now attacks foam.
Definitely no good anymore, and even before it was kinda weak compared to the others.
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Old 01-23-2023, 10:48 PM
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Hmm, 3m77 still works fine on depron, maybe the foam cores are a different composition than xps type material.

Back in the day I used UHU POR which you could get in tubes but it would take a lot to do a foam core.
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  #5  
Old 01-24-2023, 10:54 AM
shockwaveriderz shockwaveriderz is offline
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Quote:
Originally Posted by burkefj
Hmm, 3m77 still works fine on depron, maybe the foam cores are a different composition than xps type material.

Back in the day I used UHU POR which you could get in tubes but it would take a lot to do a foam core.


I was going to say UHU POR too, but you might take a look at Clearstick. Try it on some test pieces first.
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Old 01-24-2023, 11:12 AM
rocket.aero rocket.aero is offline
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3M Hi-Strength 90 might work. I prefer it to the much weaker Type 77.

https://www.3m.com/3M/en_US/p/d/b40069424/

Experiment first on scrap, yadda yadda. You should be able to get it at Home Depot.

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  #7  
Old 01-24-2023, 06:08 PM
jetlag jetlag is offline
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Quote:
Originally Posted by shockwaveriderz
I was going to say UHU POR too, but you might take a look at Clearstick. Try it on some test pieces first.


Can still get UHU POR from Amazon, ebay, Etsy.
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