Joe and Brian.....
If you don't have a vacuum sealer, the secret is to have the plastic wrap TOUCHING the meat in all places. This effectively puts a barrier between the meat and any air.
I used to lay out the wrap, place the rack on it bone side up, then carefully "rock" the rack to cover the meat side and use my hands to smooth the wrap on the bone side.
You won't get 100% of the rack covered, but you will be close!
Good Luck!