There's a couple ways I've done this. The one I showed is a Chevron Striped manicure (the V shape thingie). That one I did by buying these little nail guides, they're like sticker things that you apply to your nail to help you paint straight. You place them on, paint your white tip, and peel them off again. The problem is, if you peel them too soon, the wet white polish will run a little and ruin the clean line, but if you wait too long and the polish over-dries, the white will peel up with the sticker. You need to let it just get to a tacky stage. Then I clean it up and make sure it's really straight with a Qtip dipped in polish, then paint over the whole nail with topcoat. You could do this with just regular tape or whatever also.

The other way, if I'm doing just a regular, straight across white line, is to buy a French Manicure pen. It has a wide felt tip and you "draw" the line across yoru nail with it. It takes practice because it's nail polish, not ink, so it does tend to blob out every now and then. But once you get the hang of it, it's easy. I found that the easiest thing for me when I had squared off nails because it was just a straight across swipe for me.

There are also french manicure kits out there with narrower brushes to help you get the line right. I've never tried them out or researched them much... not sure I could totally free-hand it like that.

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