I have tried Leatherique a couple times to soften up rough leather and found it did not make any difference at all. The leather felt exactly the same as before using it. I let it soak in hot sunlight and even put saren wrap around the seats and treated areas but it made no difference. I then tried a product call Surflex Sofner, which is very similiar to leatherique but looks to be a little thicker and concentrated and does not need to be removed with a PC product, I went all out cleaning the seats with
Wolfgang citrus based cleaner and used the whole can of sofner, wrapping all treated parts in Saran Wrap and leaving it outside in the hot sun with a space heater in the car, and using a hair dryer this took 2 days and afterwards I said forget trying anything else it if this does not work. Pretty much the same results, the leather felt no different before this process, maybe just a hair softer but nothing really noticeable. I have been told that Japanese leathers are treated with some kind of silicon sealant that will not allow any kind of condtioner to penetrate which essentially means the leather will prematurely harden/gets rough and cannot be repaired/nourished/softened because the conditioner will not penetrate and just sits on top of the sealant, others have had the same results. What you feel is not the actual leather but the silicon sealant. I guess leatherique, surflex, and connely hid food is more for Italian, English, and some German leathers that do not have these strong silicon sealants and can be nourished and softened up but will not work on most Japanese leathers as well as some others treated with these sealants that help protect against stains but ruin the leather/feel/smell/properties.