The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

LT7A · 01-08-2022, 07:14 PM

It may have been an attempt to sound or thermally insulate the cab. But as CG alludes to, it is a rust issue. It will trap moisture. So getting rid of it is a good idea.

01-08-2022, 07:14 PM	#3
LT7A Registered User Join Date: Oct 2015 Location: PNW Posts: 3,512	Re: Is it spray foam? It may have been an attempt to sound or thermally insulate the cab. But as CG alludes to, it is a rust issue. It will trap moisture. So getting rid of it is a good idea.