As erine1881 mention, Powerpoints are NOT safe for use in the water-line. The only three MAC liners that are safe for use in the waterline are Kohls, Tecknakohls and Kohl Power.
I can't tell you how many people I've given thisinformation to at the coutner that respond with things such as "No wonder my eyes hurt all of the time." "No wonder my eyes are dry all of the time." If you use a liner that is not safe for your waterline irritation, infection etc. can occur. One of the major thigns that happens is you tear duct becomes clogged and your eyes become dry and irritated.
Stick with the products that are safe.