dexterbiker said:
I do remember going back to what you were actually asking when i was a kid we were akways told not to put stickers on crash helmets as it can affect the way they work, still to this day i cant understand how
The solvents used in the adhesive can eat into the bonding used in the helmet shell. Over time, this can create a weak point.
Different stickers use different adhesives so will have different effects and modern helmets will likely be more resilient to most "standard" adhesives, but you won't know for sure.
I would be surprised if there was any measurable effect during the normal lifetime of a helmet (we all replace them regularly every few years, don't we? :roll: ), however if you had an accident and your helmet failed while being plastered with stickers, the insurance and helmet manufacturer might try to weasel out of any compensation.
Many years ago, you used to be able to go to provincial airports and get a peek of your lid in the x-ray machine if you asked very nicely. This shows up stress patterns and can identify weak points. Not really an option these days.
Personally, I have a camera mount stuck to my helmet and wouldn't worry about sticking some reflective tape on it.
This message represents my personal opinion and I am not an expert and am not recommending any particular practice, blah, blah, blah, don't even think of being able to sue!