i'll agree with these guys, pros do it best. The stuff from Murray's or Walmart or wherever sucks. I know people that put it on, it comes out that purplish tint, i know you've all seen it....but hey, you can get lucky. I know a guy who bought 5% tint at a place, and put it on his 5.0 mustang....it came out perfect, his first time doing it. But yea, dont just go to the first place you find, search around for prices, or better yet, get some local's opinion.....usually if youy know someone, you get great prices. I live in detroit area, so I just went over the bridge to canada to a guy's place i knew, and i got the tints done 20% all around for 100 bucks canadian which is like 60 american! now, you may not get as lucky, but just search around, it's worth it....