yea tell me about it...this is my third car with this color... its impossible to find this color and I even used to work at a dealership. I have a coupleof bottles from a few years ago that I guard with my life.
For touch ups I use the fill it in with a few coats till its thicker than the original paint.. wet sand it down... buff it method. Some colors blend better than others but I figure a slightly different shade is better than primer or bare metal/rust