After years of frustration with Infiniti Corporate regarding the deplorable dash issue with many of our 2006-2010 M's, I have found a reasonable solution that I wanted to share. Yes, I had the passenger airbag SB done, and no, the dealer would not offer anything other than "free labor" and a $2200 material charge for a new dash. No chemical has ever been put on my dash in 10 years that I owned it other than moist towels. Yes, I'm a little bitter over the whole thing, particularly since my car is garaged all day long, and has been for over 8 years (before any cracks developed). Love the car, but sadly now anti-Infiniti.
My dash is awful, with probably 20+ cracks. I recently found a company that makes a cap that fits rather well over the factory dash. I have not posted on this site before today, and have not figured out how to post pictures yet, but I will work on that and see if I can post a before and after picture. The color even matched perfectly. I have the tan seats, and the taupe/brown dash. Their "taupe gray" was a near perfect match.
The company is Coverlay Manufacturing, in Texas. You can also buy through Rockauto.com and save a few bucks. The cost was about $200, a little steep but considering alternatives, tolerable. Their customer service BTW is fantastic. The cap is roughly 2 mm thick, and fits the contour well. I'm a perfectionist, and did a little sanding and filing to improve the fit. It is glued down by supplied silicon. It is a little tricky to glue down, but what an improvement over the current situation I had. There is a raised edge around the center speaker area, but otherwise looks darn good.
I probably gained $1000 or more in resale value, and wanted to pass along to any other frustrated M35/45 owners.