If it peels off it probably will, Since seeing the R3R's with the blacked out grill's I want to do it to my bike. Not being a body man I hesitate to do anything myself. I did read on this forum a R3 owner sanded the hell out of his grill before painting and he didn't mention peeling. Your bike looks great btw,
I painted my grill (and the 2 smaller ones behind the rad). No sanding needed just a good clean and the right sort of paint (I used Rustoleum satin black) with several light coats. Have touched it up twice in 3 years to cover up what were almost unnoticeable stone chips but it holds up really well.
I cleaned and de greased with petrol first then applied several coats.as I understand it that's all that was required.the edges peeled and when tightening the bolts the film spun round with the bolt.what a mess.i left it overnight to dry before doing this.i still have 2 cans left but would rather buy genuine black rad cowl....by the way it looks great on a classic with the blacked out cover.
With the amount of dirt on mine most of the time, it would look flat anyways. Shiny is for people in cold climates that need something to do in the winter.
I'm considering Plasti-diping the 'backside' of my new "sportshield". The clear coat afforded by the 1/16(?) inch thick plexiglass should give a decent gloss coat to the otherwise flat black "dip". It being removable would allow me to go clear again if later desired.