Lol. I don't use a lip primer, coz I think that vaseline is a really good substitute. It softens the lips and helps the lipstick glide on smoothly. Plus its cheap!
In the name of Allah, the most Beneficient, the most Merciful!
Hmm not sure actually! But if u apply lipliner in the same shade all over the lip first and then apply the lippy over the top, that should help it last.