Just thought I would add my 2 cents, the only way you can get your polish to stay on while in a hot tub, is to use a good base coat and top coat,(and try not to stay in to long, also polish does stay on nail enhancements better then natural nails) airbrushing will not hold up to the hot water, it will just peel or slide right off (natural or not). I would suggest a good Base and Top Coat from OPI or Creative either brand is great, also before you polish make sure there is NO OIL at all on your (natural)nail plate, that way the polish will have something to adhere to....so it will stay, base coat,follow with 2 coats of color and then 1 coat of T/C.....I do this will all of my clients, but then you have some that can't keep polish on no matter what you do, and those people usually have oily nail beds.....so you really have to dry out the nail to get the polish to stay...then you can still have problems.....but each one of us are different.....so you just have to play around with it till you find something that works for you. I just know what works with me or my clients because I see them every week....hope that helps....