Interesting thread!
I have some Filson waxed cotton garments that I just use the Filson wax on. I do have an old Redhead waterfowl jacket, probably from the 50's that was my uncles that I've wanted to treat with some sort of wax.
Thanks for the recipes you guys have provided. I'll give the old Redhead jacket a treatment, using a recipe provided.
On another note, in my youth in the early 70's, working for the USFS, a guy I worked with took a pair of his work jeans and soaked it in bucket of Thompson Water Seal, then hung it up to dry for a couple of days. It was stiff when dry but it provided some serious water proofing to the jeans and through wear the jeans did soften up a bit.
Not sure how long the waterproofing or the jeans lasted, since as typical, the weather turned hot and dry as summer progressed and he switched to wearing other, non treated jeans.