Is it safe to use Pam cooking spray to limit rust on my gas grill?

After I use our grill and it cools down, I spray the grates with Pam cooking spray. We've had problems with the grates getting rusty (even though we keep it covered). My thought is that the Pam might prevent rust from forming. But I'm worried it might also encourage bacteria or mold to start growing on... show more After I use our grill and it cools down, I spray the grates with Pam cooking spray. We've had problems with the grates getting rusty (even though we keep it covered). My thought is that the Pam might prevent rust from forming. But I'm worried it might also encourage bacteria or mold to start growing on the grates. Is this something I should be concerned about? Is there something else I could spray on the grates to prevent rust? Obviously I can't use anything like WD40.
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