It's 20 years or so since I last 'Lasted' but I sure can't remember it evaporating before coating a side. Maybe they've changed the formula?
I can't say though that I can hear any difference between my Last treated LP's and those that never 'had the advantage'. I clean all my LP's on a VPI vacuum machine with my own home made fluid and no longer find the need for anti-static treatment or any other exotic processes. Just keeping the LP's and stylus clean is all I now bother with. Save a lot of money too.