The story on buildup is, you don't want it to build big or it will probably temporarily worsen your lips.
You want to keep it moist, sterile, and a small amount of buildup on your lips at all times, that first protective layer. Most will wash off with the products/vaseline in the morning and remain thin just don't take off yourself.
I'll stay around a bit. I'm going to write a full summary to put on Daniels forum.