Every few months I always give my catch a clean with wd or similar to get the grit out then spray some spray grease to keep things lubed.
Had a bonnet come up years ago (Not an Alfa!!) and I don't want to experience it ever again.
Glad you have her sorted, I love the look of your motor. Colour and wheels.
I've just happened upon this thread, and it suddenly struck me that many new cars with their 'pedestrian friendly' front end designs make it very difficult to be sure that the bonnet is fully shut. It may look shut, but you can't get your fingers between the leading edge of the bonnet and the front bumper 'trim' to check.