I have to agree BOCO has some fantastic information! What I can offer you is I use TruBond products! And the first Fox I did with their stuff was extremely easy, safe and 3.5 years later the leather is completely soft! The reason I tried their product is I only have use of 1 arm! And the Company and testimonials were the best when it came to ease of “ breaking”! And to my surprise and thankfulness. The breaking could not have been easier! I was amazed at how easy it was to stretch the leather. And as I pulled the leather ( held between my knees and pulled with one had! Added so you can see / imagine how easily it stretched) I could see it in real time as I pulled, the leather turned a milky white and was instantly soft! I even did a Fox after he was on the board, dried and waited because of circumstances until June with one of them! Just rehydrated the pelt in 4 gallon of 100 degree water, 1lb salt, 4oz of their Lipo 55 and 4oz citric acid. Just stirred pelt a bit every 5/10 minutes for an half hour. Then followed their instructions from there. And it turned out just as nice after hanging in fur shed for 5 months before starting the process as the ones I was able to do soon after skinning!