Real Deal Spolas

[Feinman]

I was going to make a final waterproofing coating that could be reapplied, containing tallow.  A little searching and I found Wren's Dubbin; it contains the ingredients I was going to use (and a few other things), and I applied it to my test piece (which I can later usr for a second armour with some Deepeeka scales I have), and the results are perfect!! So I'll be using it, as a final coating.  It doesn't damage the leather, as the leather is already casein / water treated first.

Personally I would'nt use a fat based waterproofer as it needs to penetrate the leather to be effective and otherwise is just going to leave a greasy coat on the surface, I would have thought what you've already done would be sufficient... its the sort of thing I'd normally use on leather boots for wet weather.
I thought the Wren brand had been discontinued actually nice to see its still going...

Just my opinion

Thanks for the advice Ivor! I will hold off for now and watch the test piece. I was interested to see what would happen, especially if it would darken it in any way or affect the adhesion of the casein, but because that was deposited into the fibers p, it is really one with the leather, and can even take extreme bending without any cracking. Water beads right up on the surface; the question is the possible darkening of the oils and tallow over time, but there should be evidence by the time things are done. The inner layer will have the skin side facing the wearer; I will seal that with the oil / beeswax, maybe dubbin at end, to stop sweat from permeating the leather. I just want the finish to be durable, tolerate marching, camp and battle.