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Old 03-11-2004, 06:07 PM
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Firewall insulation

I am installing two-sided foil insulation ( purchased from a home improvement store) to my firewall using 3M Super 77 adhesive. The insulation is about 1/4" and is very light in weight. Is this adhesive going to hold up in the heat or should I have used something else?I am about 50% complete with this project

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Old 03-11-2004, 08:35 PM
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No, 3M Super #77 will not hold, especially if exposed to heat. My other hobby is radio control airplanes. One of the building techniques is building wings with foam cores and covering them with balsa sheet held in place with either contact cement or epoxy. Quite a few years ago 3m 77 was the "cat's meow" as far as contact cement went. The environmental guys forced a change in the formula and it hasn't been the same since. It has been an ongoing battle to wean people off 3M 77 for sheeting wings. I cannot tell you how many beautiful airplanes I have seen come apart in mid air because the wings skins came lose.

3M makes another contact cement that is far superior to 77. I cannot recall the number at the moment, but Krist will probably weigh in here and give it.

Vince
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Old 03-11-2004, 11:06 PM
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Hey, Vince

Are you thinking of 3M Foam Fast 74 ... ?

Alan
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Old 03-12-2004, 06:02 AM
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I used the same foil backed insulation and 3M Super 77 adhesive on the firewall of my pro-street 41. It's been over 6 years with no problems at all. I don't think heat has anything to do with that particular adhesive holding, I believe it depends on the material your using.

It's possible that the styrofoam model wings 302/Z28 is talking about may have had a reaction to one of the chemicals in the adhesive and cause the delamination, I'm not really sure. All I know is that I've never had a problem with 3M Super 77.

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Old 03-12-2004, 05:42 PM
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The formula for 3M #77 has changed withing the last six years.

The R/C planes I have seen wing failures on were due to delamination of the contact cement, not the glue attacking the foam. R/C builders are very sensitive to any glue they are going to use on an expensive foam core and will not use any adhesive that will harm the foam core. I have sworn off contact cement altogether when sheeting a wing, using epoxy exclusively.

Vince
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