Erine said they are not waterline safe as they have the texture of Pearlglides. I've used Designer Purple on my waterline with no problems, but that was me going against the recommendations.on another note, I hope those fatties are not overpriced...and i hope you can use them on the waterline and they actually stay put. i think that's the only thing besides that strobe cream that im interested in. The lipglasses are pretty too but one of them reminds me of that Flash of the Flesh and i haven't even used the one i have.