I have a piece of saddleback which I tried to finish the edge. You cant use gum trach. Since it is already stitched it is very difficult to finish some edges. I tried to wax and burnish with jeans but only successful on certain parts (shoulder strap, flap closure and some other parts. some parts are just not accepting this method.
Saddleback was the company that lured my interest in leather in 2012. Nowadays I feel their products is just cut and sew. I have a sachtel which starts to fray on the edges. And some edges on the bottom looks mushy and going to fall apart. So I tried to do something to the edges but with no success.
Maybe the only solution is to use those rubbery edge coating.