I like paint markers for marking stock, labeling equipment, and labeling plastic storage boxes. They work pretty good, but a lot of them don't last for.. shi... er I mean manure.
Sometime back (several years) somebody on this group suggested Xylene based markers. In some ways they kind suck. They smear for a while, and take a long time to cure, but the markers themselves last for a very long time, and after the paint does cure it holds up really well. I might have run one out of paint, but I have not had a single one dry up on me. I'm not actually sure I have run one out of paint.
In the past I had bought paint markers at an education supply store. They were okay, but they didn't last. One day in my local fastener store (Copper State Bolt & Nut), I saw Milwaukee paint markers on the shelf. The really sucked, didn't last dried up, and gummed up. Total waste of money.
I came on this group to bitch and whine about it, and a member suggested Xylene paint markers. I've been using them for years now with little issue. Mostly just long cure time. There is one other little issue. I use them to make lines on my write erase boards for tracking jobs, chores, and maintenance. I think the flash off chemical in the write erase markers can affect the paint. I have to refresh the lines every once in a while.
Over all I can't imagine using any other paint marker except for the limited number of colors.