Chiming in a little late here, sorry. At home with a cold and I'm bored...
SEM is, in my opinion, an awesome product. I've used it for quite some time and would only switch to DupliColor if forced to.
I just finished a dash refresh project, recently, and used the three colors below.
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The local paint store was able to find the mix codes for me, in a mix table, provided to them by SEM and the color came out very, very close (Dark Cognac/Brown match). The Camel is a very close match to the lighter stock color (Light Cognac) as well (and was readily available off the shelf) close enough that I just went ahead and used it. The Satin Black is my preference for most stuff that needs to be Black again, I used it to paint the glove box door latch.
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My prep is simple: Dawn liquid dish washing detergent and a scrub brush to help remove any dirt and oil/grease contaminants, rinse with clean water, let dry and then use 70% Isopropyl rubbing alcohol just before spraying to get rid of any other stuff (you would be surprised at the remaining dirt/stuff the alcohol gets). Have used this method for a long time and have never had an issue with SEM products lifting or peeling.
Cheers