CND has these vinylux nail colors that endures a week of application, without a base coat.
VINYLUX dried naturally and real fast. It gave a flawless finish and I found it pretty pigmented, therefore didn't apply the second coat. So far It didn't chip either. great prices on Amazon.com
Give it a try !

When applied with CND Vinylux Topcoat, they claim that Vinylux shades lasts for a week on the nails. Vinylux is a simple two step process that requires no base coat and is applied like regular polish. You have to apply apply 2 layers of colour then apply Vinylux Topcoat. With natural light exposure the Vinylux Topcoat gets more durable resulting in a week long manicure. Price: $11.95 for the polish and $11.95 for the top coat.

I find that it worked well. Both my mother-in-law and myself tried it. It lasted well over a week for her, for me it lasted about 4 days (but it was not a really sunny day when I put it on, so maybe that had something to do with it). The polish was easy to put on and it dried quickly. The Gilded pleasure color was gorgeous and I got tons of compliments on my nails. Definitely worked better than regular nail polish. I would buy it again