I am not sure what you are wanting to insulate against, but we used one layer each of two Second Skin products in our cab floor area, and on our 3000 mile trip we notice none of heat or sound issue that folks with 6.0 PSD folks have posted about. ...so we are very happy...
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Greg in Austin
2008 Ford 6.0PSD EB/E-PH SMB 4X4 Aluminess f/r bumpers (13.5mpg avg, 15mpg hwy) 52k miles [Texas McBeast]
2006 Toyota Prius (48 to 68 mpg) 120k miles [Penelope]
2013 Jeep Wrangler Unlimited Rubicon (15 to 18 mpg) [Johnnie]
2012 Mitsubishi MiEV (no gas required) ($.50/day in electricity) [Evie]
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