We’ve tried it at home. We’ve done the booth. We’ve stood stark naked before strangers and had every inch of our bodies airbrushed, only to emerge St. Barts brown on one side, Back Bay white on the other. But we never got the elusive all-over glow until we went to Bella Santé, where an almost painfully thorough full-body exfoliation precedes careful application of Phytomer’s clear (!) bronzer. It won’t streak when you sweat or rub off on your clothes, which means that even after a sticky, slow ride to the beach, we pulled up looking as if we had been there all summer long.