dude, aerosol spray paints don't last if not applied properly..
for your information, i did use the aerosol paint on my helmet, also on my bicycle.
you need a base coat first...
after 2 coats of base coat, comes aerosol..
its been 2 years and the paint is excellent, infact one cannot make a difference weather its painted...

since you are going for a silencer, stick with the same high temp paint that I've send a link of..
i am not sure weather you get a base of high temps, besides bosny is available everywhere, just ask him for high temp can, if possible go for base coat too if available in high temp..

if you go to a shop who keeps bosny, they have a catalog..
you can see it there and place an order if they don't have..
that's what i did for chrome paint of my helmet..
a can would cost from 300 to 600
120 for the base coat...

isn't it a fair deal??

well tried a few places but seems that BOSNY isn't available at most of the shops..will try the karol bagh bike market regarding a solution..any other suggestions please..