I have used the Spectrum spray product from Second Skin with much success on my '69 Camaro and am in the process of laying down their Luxury Liner Pro on the firewall and floor pan. Great customer service as well.
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Robert's 1969 Camaro - 2002 LS1/T56, 10 pt Chrome Moly Cage, HTH truck-arm rear suspension, Global West Stage III Front Suspension, Kook's Stainless Headers, Fikse Mach V's, 17" up front 18" out back, and still working on it 
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