Sound Dampening Material, Aluminum One Side
Fits: 1948-72 Ford F-100 trucks
Unless otherwise noted our parts fit only these applications: Electrical items - 12 volt, negative ground, Bed parts: 6 ½’ foot flareside (A.K.A. stepside), Body style: F-100, F1
Part #:2166
Price: $38.00 RL
Each truck takes: 1

Stuff in this can cause cancer and birth defects

Catalog History
Heat reflective, waterproof, mold-able. good for any place that might get wet, inside doors,etc. High density, use in indents or sheet metal areas to dampen vibrations. Foil over mold-able sticky rubber compound. 32" x 54" roll
I have found some stuff I like a little better but it does not have the aluminum covering. If you want aluminum this is it, if not check out 2166-B.
When installing this do not be afraid of the heat gun, get the stuff good and hot and roll it down, if it comes away from the metal, either you did not clean good enough (dust) or go back and heat it again.