Place the salmon on a baking sheet and brush it with the grapeseed oil. If desired, you can rub it with 1 tablespoon of the lime butter instead (or in addition to, for flavor). In a bowl, stir together the paprika, italian seasoning, salt, pepper, garlic, onion powder, pepper flakes and cayenne. Sprinkle it evenly over the top of the salmon filet and press gently to adhere.