One method would be to use the preserve underlying transparency toggle. It's the little "T", between Mode and Track Matte. You would set your solid above your solids and toggle it. It's not going to work if you have a full layer somewhere below the solid though.
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.