@spotiche5- Though you should ask your doctor to be sure, I do not think that it is safe to use decongestant nasal sprays following sinus surgery. These sprays affect blood vessels in the nasal passages, and may cause complications during the healing process.
In addition to not being safe after surgery, nasal decongestant sprays can become addictive because they make it so easy to breath. This sensation creates a vicious cycle of continuing to use the sprays repeatedly to open up nasal passages as the stuffy feeling returns in between each use.
Your best bet following sinus surgery is to do what your doctor orders, and stick to saline sprays that safely flush out and moisturize your nasal passages.