[Budd]

I'm looking to spray my entire cab, with a spray on sound deadener/insulator.

I'll be driving the truck 10 hours a day for 6 days next summer, on my way to Alaska.

I'll also be sleeping in the truck (want to make a sleeper), and I want to stay warm during the nights.

So what's the best product out there, that does what I need?

 

[SuperSlowTruck]

Dynamat, it's not a spray but it works!

 

[bigaaron]

3m rubberized undercoating aerosol can - do not use Duplicolor. Even though they are both $8.00 a can Duplicolor sucks

 

[chizzle1]

^ I used the 3M to coat my push bar, control arms, and spindles. Good stuff.
If you are trying to insulate it from the cold, it may be worth the time to remove the carpet and add more insulation underneath. Not much you can do for the doors except spray-on inside the panels.
Your biggest heat loss will be the windshield and other windows.