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I ran into a similar issue with the firewall on my 74 during restoration. I chose NOT to duplicate the factory sealing technique. After research, I found out on the assembly line, GM issued degrees in the fine art of using a tar bucket and small mop to literally "slop" this crap around firewall penetrations and anywhere else the mop hit along the way. I'm betting my car was either manufactured on a Monday or a Friday because I had more of this slop than most. Wonder if that makes my car more rare? hehe...
I ran into a similar issue with the firewall on my 74 during restoration. I chose NOT to duplicate the factory sealing technique. After research, I found out on the assembly line, GM issued degrees in the fine art of using a tar bucket and small mop to literally "slop" this crap around firewall penetrations and anywhere else the mop hit along the way. I'm betting my car was either manufactured on a Monday or a Friday because I had more of this slop than most. Wonder if that makes my car more rare? hehe...
I guess back in the day of "undercoating"...tar was the sealer of choice.
Well since my car will never be a show car...I got out the old wood chisel and scraped away! I literally could not see the nuts that hold the wiper mount transmissions.....I will seal neatly with black urethene and then paint with a satin or matte black. Thanks for confirming what I thought.