There are a huge number of postings about gun waxing here. Ren Wax may be good, but is probably little, if any, better than other waxes. I have used Johnson's Paste Wax on my guns for almost 40 years (the same can), and I don't know how anything could be better. Johnson's paste wax is a mixture of Carnauba wax (plant based), microcrystalline wax (petroleun based), and paraffin wax.
There have also been postings about using neutral shoe polish on guns, and I do not doubt it would also work fine. Wax is pretty much wax, and all waxes will seal and polish metal and wood surfaces. If you want to pay the price for Ren Wax, good for you. If you don't, other products will work as well and at a much lower price.
There was a posting here several weeks ago about some large gun shop using Simoniz car wax on the high-end guns it has on display. Simoniz is very high in Carnauba wax content.