The instructions say that two gallons with cover 40-45 sq ft @ 40mils thickness (one mm). 
Sorry I can't provide Vanagon specifics as it been a while since I did an entire van at one shot. Dylan? 
I'm pretty sure I bought it from Summit Racing but check Amazon and EBay.  
I sprayed my first van with a cheapie Schutz gun and and my 5 gallon construction compressor. It got the job done but I had to wait for the compressor to catch up!  It goes on thick so you don't need an expensive gun. 

Sent from my way cool iPhone.

> On Nov 1, 2016, at 1:30 PM, Edward V Barger <edvbarger@mac.com> wrote:
> 
> thank you 
> 
> Lizard skin is one thing I have been considering had read about it also  where is the best price and how much is needed ?
> 
> could do the entire floor etc 
> 
> I have a compressor will need to get a spray gun  would one of the cheep one from harbor freight work ?
> 
> and  some how think will need some thing in additional for the fire wall and engine compartment 
> 
> 
> ed
> 
> 
> Edward V Barger
> edvbarger@mac.com
> 310 922 6251
> 
> 
> 
>> On Nov 1, 2016, at 1:22 PM, turbotransporter <ramblinvan@GMAIL.COM> wrote:
>> 
>> Once you've used a water based and low voc spray on sound deadened you'll never go back to asphalt based peal n stick. 
>> Quiet Car brand disappeared from the market so I've switched to "Lizard Skin". 
>> Prep work and masking are key to great results.
>> My fingers ache just thinking about the peal n stick stuff...
>> 
>> Sent from my way cool iPhone.
>> 
>>> On Oct 31, 2016, at 8:53 AM, Toomey Douglas <drt@UOREGON.EDU> wrote:
>>> 
>>> All,
>>> 
>>> Going to soundproof my 87 westy and interested in hearing what others have tried and recommend.  I was planning to use fatmat until I saw the discussion here:
>>> 
>>> http://www.stevemeadedesigns.com/board/topic/20533-thoughts-on-fatmat/ <http://www.stevemeadedesigns.com/board/topic/20533-thoughts-on-fatmat/>
>>> 
>>> That discussion claims that asphalt based materials will not last very long and that they smell.
>>> 
>>> My interior is completely removed, so now is the time to get it done. Any advice welcome!
>>> 
>>> Doug
>>> _______________________
>