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rideair · 11-01-2018, 11:25 PM

SBTork,

I used the 3M SM400L (3/4 inch) in the roof, and the 3M SM600L (1 1/2 inch) in the doors.

You will be GREATLY impressed with how this stuff keeps the heat out.

Before putting the headliner back in place, I found even on a hot sunny day here in Virginia, where I had not finished my install, you could not touch the metal area where I had not installed it yet, but the areas covered with it, the backsides were just warm to the touch.

The reason for the thinner SM400L in the roof, the bows that go across are only about 1/2-3/4 deep, so it filled the void and was not compressed. Whereas in the doors, I could use the 1 1/2 to make sure it helped keep the sound out and filled the void better.

11-01-2018, 11:25 PM	#22
rideair Registered User Join Date: Jul 2009 Location: Front Royal Virginia Posts: 243	Re: Building a Bulletproof Squarebody Suburban: Community Input Requesting SBTork, I used the 3M SM400L (3/4 inch) in the roof, and the 3M SM600L (1 1/2 inch) in the doors. You will be GREATLY impressed with how this stuff keeps the heat out. Before putting the headliner back in place, I found even on a hot sunny day here in Virginia, where I had not finished my install, you could not touch the metal area where I had not installed it yet, but the areas covered with it, the backsides were just warm to the touch. The reason for the thinner SM400L in the roof, the bows that go across are only about 1/2-3/4 deep, so it filled the void and was not compressed. Whereas in the doors, I could use the 1 1/2 to make sure it helped keep the sound out and filled the void better.