Im in Houston as my title says, The 3M coating is available at Amin Paints in DHA phase 2 extension behind the mitsubishi workshop.
Its a one time thing, once sprayed it does not come off - and the total weight increase of the car would be about 3 or 4 kg I think, Now if you spray diesel fuel or engine oil regularly under your car - it will literally become such a mess that you wont want to own your car anymore.
The coating is only applied to body structures and not suspension subframes, exhausts etc.