There is no magic on how to soften up cardboard hard leathers.
The logic is how to get the rejuvenator (either the Fatliquor-5.0 or the Leatherique) into the leather structure.
As most pigmented leathers are too overly protected that makes it difficult to penetrates the finish (colorcoat and topcoat); even though the fatliquor is drying up one way as VOC (volatile organic compound in a very slow rate).
Leatherique uses heat to assist in penetration; while Fatliquor-5.0 uses Hydrator-3.3 (a leather-safe surfactant) as the penetrator.
The leather structure needs to be hydrated, relax and all the stick together fibers separated; acidify charge cationic (+) prior to effective hydrogen-bond with the anionic (-) fatliquor.
It is recommended to test the degree of penetration first by using a cotton facial pad; damp with Hydrator-3.3; place on the leather and seal it up with cling wrapper; leave it overnight; if the Hydrator penetrates the leather than we can smile; cos we can fatliquor the leather the same method to as soft as you wish. Otherwise it is to check with your local leather seat installer whether the leather could be removed for rejuvenation (hydrate and fatliquor) from the absorbent reverse suede side.
Hydrator-3.3 and Fatliquor-5.0 comes with the popular S250.p kit.
Roger Koh
[email protected]