What is the best roller to use for applying texture paint to walls?

I was told to use a 3/8'; nap roller but I am finding that the paint (which is very thick) is not going on evenly. It is leaving bare spots. I am using a 9 inch roller but maybe a shorter roller would be better. Your thoughts?What is the best roller to use for applying texture paint to walls?
Use a thicker nap roller, like 3/4'; or 1';. The paint will go on heavy where ever you start the roller so apply it thick about 1 rollers lenght away and work the paint back towards your last roll. You will have to work the paint abit with the roller to get it even. Just take your time and it will turn out fine.What is the best roller to use for applying texture paint to walls?
SLIGHTLY ROUGH - medium nap (3/8'; to 1/2';); longer fibers push the paint into rough surfaces without causing ';orange peel.'; Use on sand finish plaster, texture plaster, acoustical tile, poured concrete, rough wood and shakes.
Go to a paint store and buy a sheep skin roller. It's the best thing I've ever used PLUS it's reusable... really. It costs more but the paint washes right out unlike other rollers. Just get it slightly damp, paint your wall and wash it out with cold water. Great for textured walls.