i just used the sticky mounts, be sure to degrease your helmet first!
i've used acetone, not the smartest thing i ever done cuz it dissolves the plastic shell...
but anyways i used very little on a cloth so luckily i only removed the first layer of clear varnish, thereby creating a very clean underground for my patch... and for as far as i can tell its bombproof !!
some things that were mentioned in the manual; the 3M sticky patches should be applied in roomtemperature, so make sure both your patch and helmet are at roomtemp. and it should "dry" for about 12h before its at full strength, and as mentioned above, make sure you start off with a superclean underground !