What I like to do is on the night before, remove the membrane, wipe ribs down with a paper towel. Then I coat the ribs with italian dressing. I use home made dressing, but I'm Sicilian, so use whichever you like. I put them on a tray and cover with plastic wrap. I do not wrap the individual racks. Day of the smoke, wipe them off really well, and rub them down. I don't skimp on my rub either. I generally don't even put sauce on mine. I don't wrap them and I don't spray them. Also, I'm on a master built propane smoker. Plain water in the tray. My rub is:
1 tbsp garlic powder
1 tbsp onion powder
1 tbsp brown sugar
1 tbsp salt
Fresh cracked black pepper
1 tbsp paprika
1 tsp ground clover
1/2-1 tsp cayenne pepper
A shake or 2 of chipotle powder
1 tsp of white sugar
Adjust amounts to your taste. Those numbers are where I like to start. Good luck!!