I grew up riding horses and cleaning tack was a daily routine. We used glycerin and my riding instructor advised wetting the soap and not the rag. That way here was less soap lather to remove and the oil from the soap formed a protective layer on the leather. If the leather was tacky even after it was dry, you could use a damp rag to over the leather once more. Glycerin leaves leather soft and protected.
Typically "leather seat trim" means that small amounts of leather are used decoratively as accents. "Leather Seats" typically means that the seats are upholstered almost entirely (more than 90%) with leather.
They're called chaps. From the Free Online Dictionary: chaps pl.n.Heavy leather trousers without a seat, worn over ordinary trousers by ranch hands to protect their legs.
any glycerin can be used for dry skin
It may be possible however it depends on the material used for your original seat covers and the material you intend to cover you seats with. Can you elaborate on the material types.
Some common ingredients found within saddle soap include a mild soap, glycerin, lanolin, and neatsfoot oil. Beeswax is also included in saddle soap to protect the leather from deteriorating.
Watercolor paint, similar to the type you may have used in kindergarten.
The hide of a cow. There is no "kind" of cow skin, just any old cow skin that has been tanned into leather is used.
Cordovan is actually a beautiful dye process used on leather. The effect is that of a deep maroon color that has black bleeding into the edges. This treatment was frequently used in the '60's on "Wejun" penny loafers.
Triacetin is glycerol triacetate - an ester made from acetic acid (vinegar) and glycerin. So they are similar in that glycerin is used to make triacetin. Triacetin is used in foods as a humectant - it keeps them moist. Glycerin does the same, however it is also slightly sweeter.
It maybe somewhat unnecessary, because alot of hair products already include glycerin.
Glycerin is used in many soaps and cosmetic products. Paraffin becomes very brittle at room temperature, so it would not be beneficial to substitute glycerin for it.