beautiful work. cutting stencils is a boring job, but there is almost nothing more beautiful than spraying a stencil and being impressed by the result.
it's not that much of a difference. the graffiti spray cans (montana, mtn or molotow) are specifically designed for graffiti, so the characteristics are a little better for spraying on walls. but don't buy regular spray paint at the construction/diy store. that stuff has bad characteristics. the salesman where i bought my spray paint from told me, when i asked him about the bad quality, that they use old ship vanish.