From experience I say absolutely not! Even tho your under something your still way too close to the UV rays, which will harden your nail brush, over cure your nails and can risk even entering you polish bottles and spoil them! Believe me, I learnt the hard way!!!!! I was doing a bachelorette party where they were having a poop party so I thought it would be fabulous to do the manis outside where all the action was. All my polish brushes were as stiff as rock when it came time to treat just the second client and I had 5 lined up after her!!!!!! Luckily my coworker had two brand new bottles of top and base. Had to move it all indoors. (I've even experienced brush stiffening being 20ft across the room from a cathedral window.)