Here are both seats installed. I never took a "before" photo of the passenger side and had the driver's side back in the truck before thinking of the "after" photos. Below are both installed after refinishing. They look lighter in the photos but are almost imperceptibly lighter in person. I'll post some photos taken in daylight as the flash seems to skew the tint.
Both Color Plus's Surflex and Furniture Clinic's colorants are water based polymers and both have both positive and negative reviews online. I looked at both and, in fact, purchased the leather softening product and flex fill for crack repair from Color Plus. FC has the superior website with very detailed instructions for each step in the process. Based on my research, I believe both products will perform well IF the leather is prepped correctly. But only time will tell. At the end of the day, it was worth the $200 or so I spent. If it doesn't hold up, I'll either redo them with another product or (more likely) install one of the better seat covers I've read about on this forum. I just can't justify $700+ for new leather on a truck I just purchased for $6,700. But I could not leave them as is, they were UGLY.
I left out a couple steps in my earlier description. Here's the full list:
1. Remove seats. I cannot imagine doing this with the seats installed.
2. Strip to leather with lacquer thinner and steel wool (medium)
3. Allow to dry 24 hours
4. Apply leather softener liberally if leather is dry (I did at least 3 applications of ColorPlus's Soffener product)
5. Allow to soak in for at least 24 hours.
6. Wipe off seats with with damp cloth to remove any excess Soffener
7. Fill any cracks with Flex Fill (I used ColorPlus's product). Don't go too crazy with this as you'll be sanding off any excess.
8. Allow to dry for at least 24 hours
9. Sand Flex Fill smooth. Also sand any rough leather. I used 320 grit.
10. Apply FC Leather Binder. Usually used only on cracked areas but I did the whole seat.
9. Clean again
lightly with lacquer thinner and then with alcohol cleaner.
10*. Using air brush, apply the FC Adhesion Promoter in multiple coats, multiple directions. I think I did 3 or 4 coats. Dry between coats with hair dryer
11*. Immediately begin air brush or soft hair brush application of colorant. Dry with hair dryer between coats. Apply as many coats as necessary to get full coverage. Mine took 4 coats I believe.
12*. Using air brush, apply Leather Finish (aka Top Coat). I chose the satin finish. Dry between coats with hair dryer.
*I also added FC's Cross Linker product to the adhesion promoter, colorant, and finish coats.