Hee, hee, I thought everyone knew what Ziebart was. It's probably the oldest after market under coat process. I've heard the same criticisms about plugging up drain holes etc. In times past, I think it probably was a benifit on a new car with a clean under carriage. Now, all new cars come with undercoating and rust preventive treatments. I think there's no longer any need for after market treatment. It's also pretty damned expensive. Several hundred bucks if I remember correctly. Just my $.02.
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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