I normally have my car in the garage where I have a nice dark brown rug for drips . But when I park on a beautiful concrete they are very obvious.Imagine out of sheet-metal making something that is 20” x 12” that is a half inch deep..Once a year when I change my oil , I have to take this sheet metal off and scrape or wipe off the dry oil.
At our sheet-metal club here in Sun City West Arizona they might just put a little one eighth lip
Any thoughts?