Squeegee marks will go away once it's sat in the sun for a few days, nothing to be alarmed about, although it can look a little crummy at first.
For materials, for vehicles our preference is Clear Focus 50/50. For short term jobs that you don't need to worry about lasting more than 6 months or so we'll use Solvex, it's alot less expensive but it won't last as long. We also use Solvex for shorter term windows as well (although we do have a huge 2000 s.f. window job that was supposed to be temporary that's now been up for 3+ years and it looks as good as it did the day we installed it, and with no laminate at that!).