Originally Posted by brocken

Please tell me my eyes are deceiving me and you didn't say plasti dip...

You can purchase the automotive grade vinyl like the 3M that's mentioned in wider sheets.
They have 3" wide rolls but you can also find the 3M matte black in 1'-4' wide sheets. They do whole cars with the stuff.
To make something contoured look good it just takes a little extra work and a heat source to shape it.

Plus, it's completely reversible. The 3M adhesive is safe for automotive paint.

Originally Posted by m444

The vinyl trim is available here, but takes a lot of care & patience to install;

http://www.bmwshadowline.com/purchase.html

It would be very difficult to put the vinyl trim on the mirror housings better to paint them (or plastidip).

Originally Posted by FatalBert

I would never paint them, as I only want to do things that are reversible. And as you said the vinyl tape will be too tedious and frustrating to get right.

I have 3 cans of plasti dip, 2 black and a can of clear coat. Will probably do it in 2 weeks.

Originally Posted by m444

That makes sense. It will be interesting to see how clear coat works over the Plastidip
spray.

I purchased some primed 2011 A4 mirror covers. The Audi body shop painted to match the body and installed them for $150/pair. I still have my old mirror covers.

Originally Posted by FatalBert

..... I'm interested in seeing what the rear valence in black looks like.

Originally Posted by m444

Here is flat black on rear diffuser and gloss black on the rear blade.

Originally Posted by brocken

p.s. I realize the rear diffuser would be really tough to wrap.
You could also look into having it professionally painted. With something generic like a semi or gloss black you could probably get it done for around $100.