It would seem that the painted plastic is an Achilles heel of an otherwise beautifully executed interior on the R170's, especially on the lighter colors. I am always cautious of putting my arm on the center console because I don't want to have the paint rub off.
Did you inquire about a paint made specifically for plastic? What, if any, parts and/or trim did you remove to do the job? And what did you use to clean and prep for the paint?
The "acrylic" latex was recommended for what I told them I was doing. The paint was available in "flat", "satin", "semi-gloss" and "gloss". I used satin -my wife said I maybe should have used the semi-gloss, but it looks right to me.
Krylon does make a spray can paint for plastics, it's called "Fusion". There are some colors that match well for some of our '70's GM Trans Ams and Z/28's, but you can't custom mix it, obviously. "SEM" also makes interior spray paint for re-dying panels as well, but I've only seen/used their products for American cars. You'd need to remove panels or do a massive taping-up job to use the sprays.
I am normally a little fussy/particular, and usually go over the top on these type things,
. Since it's just a toy, and I was anxious to get it looking better, I didn't remove or even tape up anything. I was determined not to turn it into a complete interior disassemble and 5 day job. Not real proud of that, but it did turn out well enough.
I used Fantastic spray, toothbrushes, and a clean white dish cloth. Just kept going until the cloth came up clean. Lots of crud down in the grain. I wiped it with another clean cloth after that, just damp with water. Last, I did wipe it down with a 3M 'final wipe' stuff that you'd use with a tack cloth before shooting real paint at the body shop. I'm not sure that was even necessary..
I used a foam brush, and was cautious around the trim, but found that it's easily removed with a fingernail from smooth surfaces (like carbon fiber) if you do get it on there. It seems to adhere very well to the other pebble grain finish, although you can
rub it off if you're trying.
I do see a coupe spots that may have benefited from some light sanding, especially around the sides of the rear part of the console, where the seat belts go. Mine has caught some abuse there previously, but all in all, I'm happy with it.