This is a good product but I had to use it in a different way to how it sugguested as, is it really possible for you to apply the lash dye to one eye when it's closed, comfortably? I can't wink very well (!) hense found it hard to apply the dye to my closed eye whilst keeping the other one open! I therefore applied it as I would mascara but very carefully and to only half of my lashes as didn't want to risk getting any into my eye as it bloody stings! It did work well. I got my friend to do it properly a few weeks later which was great as all my lashes could be done as I just lay on the sofa with both eyes closed while she applied it.
On my eyebrows it worked great, couldn't fault it.
Really don't think it lasts 45 days though? Put it on my eye brows for 8mins ish and in 2 weeks it's fully off and I need to do it again. There is lots of product in the packet though so you can do lots of applications.