i hope yawar's reply has been usefull. however peel&seal does tend to peel of if applied onto the inner skin of the roof. direct sunlight can do the damage. as for using it on the doors, well yes i have read it on alot of forums that it tends to peel off even from doors. however the same number of people say it works absolutely fine. even the members on pw who are using it on their doors havnt had complaints. So yeah, i think it shoudnt be a problem on doors, fender arches and the floor. about the roof, id say go for lambo or the more expensive stuff.
yawar has also explained why P&S does the job so well too. about where to find it. well its cheap and alot of sites have them so id say importing them isnt hard or expensive.
there is a 70% on a brand that makes deadening sheets and mats, i saw it somewhere. will check it out post the link here.