When I've used tru-oil, I put on many coats. (I need to go back to school on finishing rifle stocks). The first one I did that way was under the watchful eye of the head of Remington's custom shop. The last stock I did, I used many coats of boiled linseed oil and boy did it ever darken the stock.
There's been more than a few threads on finishing stocks here in this forum and there's been some very good advice. Before I do another stock, I'll look into the archives here. I think I did one or two with Spar Varnish, does that name sound right???
I have never heard of ArmorAll for a stock. I've used it a couple of times on a dash of a pickup but I wasn't impressed. I'm with Gnoahh regarding WD40. I go so far to say that I wouldn't use WD40 on a cattle gate. I think it was designed for water displacement not a lubricant.
I couldn't checker a stock to save my life. But I'd try it if it meant a bear hunt on Kodiak with 458Win or a Cape hunt in Texas or Africa.