I have been using WD-40 exclusively ever since it came to market, whenever that was. While I do not purposely apply it to the wood it is inevitable that some will find its way onto wood surfaces during routine cleaning. I have never had any issues with stock finish related to contact with WD-40.
For a stock protectant I use Pledge furniture polish. I have been using it for years as it works quite well. I routinely use it on aircraft windows which are polycarbonate and it holds up for a surprisingly long time. I also use it on my Mec primer tray as it makes the primers flow more freely.
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