Call, text, e-mail or live chat. However your prefer it, we are here for you. Eyelash primer is used for additional lash cleaning and for improving retention. It helps extension last longer by 1-2 weeks. Primer has slight fumes. ★ Easy To Use - Whether for a lash beginner or a pro artist, the Stacy Lash Eyelash Extension Primer - 40ml is easy to use. Simply spray the lash primer for lash extensions on micro brushes and go on to cleanse the natural eyelashes before the extension application. Have purchased this product three times already and can confirm it’s my favourite primer. Lash retention is amazing after using it SHOP ALL PRIMERS Shop Retention Queen! I think an argument can be made for both sides here. On one hand, like Gabbay said, lash primers can add a lot of weight if you're not careful and can make your mascara clumpy. On the other hand, though, I have a few lash primers that I absolutely swear by. Using a lash primer has also been one of the only things that prevents my mascara from smearing all over my under-eye area. My under-eyes are already naturally oily, but now that I use an eye cream as well, let's just say it doesn't always mix well with mascara.