I have used a Weber grill pan on my gasser for some time now cooking veggies, which I coat in EVOO before coating. But if I use something, say meat in a non-oil marinade I notice it sticks to the grill pan....My question is can I use pam on the Weber Style Grill Pan? Also will spraying pam on that effect my cast iron grates below the pan? What do you guys think about Pam and general grill use?