Yep. WD40 was developed for maintenance in Atlas rocket systems. There is a reason for the saying “best thing since WD40”. A water based, water displacing lubricant, it’s actually recommended for cleaning nickel bath fixtures so it certainly won’t hurt a razor finish. I’ve been using mineral oil on adjustables the last few months (I’m new to wet shaving) and after one use, even after removing the blade, rinsing and drying the razor, froze a clean Gillette adjustable so tight I would swear it was welded. I’m going to try WD40 and skip the mineral oil moving forward. Now wondering if the mineral oil mixes with the/some soaps to create a bond?I've used WD-40 on my Slim for many years , just to keep it lubricated, It does not hurt the finish. By keeping my Slim clean after every shave by running it under the hot water, then towel drying, 2 or 3 times a year spray some WD down the barrel, After 60 years my Slim still looks good and works great . WD-40 is not only a lubricant but also penetrates to free up things that don't move.
Duct tape and WD-40 are household essentials in this house