It did not make the leather hard as it is a thin flexible product. The leather was in pretty good condition to begin with, just worn through the dye on the seating surfaces. The driver side bolster was particularly worn and resembled a suede jacket in a couple spots. So far, 5 months later, it is holding up awesome. I only used one can, but remember I only did the seating surfaces (not the backs, sides, etc.)

I have used SEM for years, but I will warn you that if you want to "do it once and do it right" you really should use the Sure Coat product. It's the one they custom mix for you and does not come in an aerosol can. Sure Coat will last forever, most closely resembles the original factory leather finish, and is a dead match for color if they mix it right.

I used the aerosol can product - Color Coat I believe - for a quick fix and to keep my expenses down, since a gallon of Sure Coat will run about $150 or so (remember I only paid $800 for the car). The surface of Color Coat is not as smooth since you can't adjust viscosity by thinning, which you can do with Sure Coat since it's not in an aerosol can. Also, I would say my color match is only about 95% accurate. Since I did entire panels and did not have to blend, this was not an issue. Only I can tell the difference; most people compliment me and think it looks as good as new. If you just want to do a small area and blend it into the surrounding leather, you should really go with Sure Coat.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280