How To Grow Your Eyelashes Longer And Thicker. by How To Grow Your Eyelashes Longer And Thicker. Items you will need: • Vaseline (petroleum jelly) • old mascara brushBefore you go to bed cover your eyelashes in the Vaseline. When you wake up the next morning you'll find that your eyelids will be oily. So before I put any mascara on in the morning I'll just wipe it off with toilette paper or tissue.When I first did this I noticed right away the next morning that my eyelashes grew overnight!You can also use the Vaseline on your eyebrows if you feel like you want to grow them out or you just find that they are to thin for your liking.If you found this helpful please like and save!