Disclosure: I got this product as part of an advertorial. My hair is lifeless. Truly. I curl my hair in the morning, just add a little lift at the crown, then I add a little under curl at the ends. Followed by a hefty, I do mean HEFTY spray of hairspray.  Then if I stay inside my hair style will last all day.  Outside, wellllll not so much!!  Hello Sebastian!!!  Sebastian Shaper Plus is one of the best working hairsprays, the perfect balance between flexible and firm hold. So, of course I had to test it out on the hottest days we’ve had in San Diego so far.  Hair washed,…