-Essie Matte Topcoat in Matte About You
-Sally Hansen Topcoat in Hard as Nails Hard as Wraps in Clear
Step 1: Apply 1-3 coats of Clear Topcoat over your completed nails (If you have any glitter, shimmer, etc in your nail polish you'll need to apply more coats as Step 2 may alter the color, especially in those types of polishes)
Step 2: Apply 1-3 coats of Essie Matte About You (You can generally tell how many coats you need by the after-texture each coat leaves after being applied, in general the more you apply the smoother the nail will be). If you want to keep a matte look to your nails then you don't need to proceed to Step 3. Let Dry.
Step 3: Apply 1-2 coats of the Sally Hansen topcoat again once Step 2 has dried. Let polish dry completely and your smoother more flawless nails are complete!
P.S. This is just the brands that I use to do this but it may work with other brands as well. I know this may seem like a lot of coats of polish but it can generally be done fairly quick and the more coats that are built up on the nail the more it gets that press-on nail look as press-on nails sit higher up on the nail then natural nails tend to.