I know mascara is usually prohibited when wearing extensions but this water based formula is safe for lash extensions as long as you are following correct lash aftercare, by cleaning them daily!! This Water Based Lash Power Mascara is perfect for Natural or Extended Lashes. Creates Exceptionally Long, Thick and Curly Lashes. Water Based Mascara so can be used on both natural and eyelash extensions (without affecting the glue bond).