Since this is the no logo version, there is a space to the right of the screen you could use. I was thinking about getting a few of these laser engraved.
If you decide to do stencil and spray paint, I recommend you cut your stencil from vinyl or stick back plastic and stick it on well before you spray and let it dry fully before you remove it, this will prevent any over spray you might get from a paper stencil. Once the paint is dry give it a thin layer of clear coat so the finish is even.
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wuz_uk are you vaping it at 30 watts? I tried 30 on my kayfun which is at 1.3ohms... I got a lung full of burnt cotton! haha... The air flow is way too small on kayfun to keep up with that amount of power. 30 watts on my RDA at 0.4ohms with airflow all the way open however, was very very nice.