After messing around (messing as in a mess) with plastidip, I painted my cx-5's rear emblems black.To make the paint stick better I tried to scuff up the chrome and found out that it's like real chrome plating on the plastic and chrome is a hard substance.and there is the risk of rounding off sharp edges and ruining the looks if you get too aggressive.
I ended up painting them first with an "etching primer" and top coated with a black Rustoleum.Not wanting shiny black or dull flat black I used semi-gloss which actually was the better choice.They never chipped or peeled in the 2 years they endured the elements.
All of them were stuck on with some gummy adhesive which I scraped off before painting and used to reattach.The "cx-5" letters had no locating pins on the backside,just adhesive.The big "M" had two(?) locating pins on the backside that fit into holes in the sheetmetal.The "skyactiv" emblem I think was only adhesive,no holes.
Finally got tired of the black look and bought OEM stock,chrome,emblems off ebay and went back to original look.Was not particularly cheap (go price out new emblems at some places--- the prices of these pieces of plastic will shock you).These were installed with "3M AUTO super strength molding tape".Basically double sided sticky tape for attaching automotive trim pieces.It works well so position things properly before putting them in place.It helps to take a few measurements before removing emblems so they go back the same and don't look crooked.
So, black emblems--- been there and done that.Turned out to be a passing fancy. Good luck whatever you do. Jmaz