firewall pad insulation glue

[gmcdeadhead]

does anyone what kind of glue that black tar like stuff was used by gm to glue the firewall pad on the interior firewall? i want to used that same type of glue/caulk on some other things. thanks

[Willie Makeit]

the firewall pad is held to the interior (cab side) of the firewall with rubber plugs, not glue.

[gmcdeadhead]

the pad itself is held in by plugs but the upper part insulation on mine was glued in from gm

[kwmech]

Ahh, I think you are referring to the part that moves up under the upper dash by the speaker. I think GM just used a high contact cement

[gmcdeadhead]

yes , its all in the upper part of the dash, what type of glue could this be , it was some sort of black tar, not so much a contact cement but like a splatter of caulk

[kwmech]

I have no idea, but I know it takes almost a blow torch to get the stuff off

[randy500]

I think that was just contact adhesive that was sprayed on, years ago that stuff was not black it was yellow on the ones I removed long ago.

[71CHEVYSHORTBED402]

Originally Posted by kwmech

Ahh, I think you are referring to the part that moves up under the upper dash by the speaker. I think GM just used a high contact cement

Sounds like. Cotton batting and contact cement. There's one above the heater box and one on the drivers side. They basically fit on back of and underneath the cowl.

Here's one on the driver's side:

[gmcdeadhead]

thats it, you got it ., is the black tar like glue just contact cement? or something else?

[71CHEVYSHORTBED402]

Originally Posted by gmcdeadhead

thats it, you got it ., is the black tar like glue just contact cement? or something else?

Wasn't black. I hear spray-on contact cement is the ticket. The batting came off easily as one piece. Not a lot of fragments left on the cab after removal, and I didn't use a heat gun. Perhaps not contact cement. Bet this works: It's 3M and I do like 3M: https://www.amazon.com/3M-90-24-Spra...contact+cement

[gmcdeadhead]

Wasn't black

The batting came off easily as one piece

mine was black, and the batting was a ***** to get off , stuck on good , hard time scraping it all off.

['68OrangeSunshine]

The black tar was in the jute to hold it together and be water resistant. [Old tech.] They still used adhesives -- either 3M Weatherstrip Adhesive ["Supersnot''], or 3M 77 Contact Spray Adhesive.
In hot climates [like Tucson] the tar would melt in to the floor and firewall. I had to use a lot of turpentine and rags to get it up.

[71CHEVYSHORTBED402]

Originally Posted by 68OrangeSunshine;7887453]The black tar was in the jute to hold it together and be water resistant. [Old tech.] They still used adhesives -- either 3M Weatherstrip Adhesive ["Supersnot'

, or 3M 77 Contact Spray Adhesive.
In hot climates [like Tucson] the tar would melt in to the floor and firewall. I had to use a lot of turpentine and rags to get it up.

Good stuff. Not the tar I mean

[gmcdeadhead]

The black tar was in the jute to hold it together and be water resistant

mine was on the metal before they put the jute in. you can see the splatter from the caulk gun or spray gun they used

['68OrangeSunshine]

Originally Posted by gmcdeadhead

mine was on the metal before they put the jute in. you can see the splatter from the caulk gun or spray gun they used

OK. If you say so.
I wasn't there when they built your truck.
Could be different years and different plants may have had varying procedures.
What year and what plant produced your truck? You have a '66 or earlier in your avatar.