We've had a spate of computer and projectors stolen from schools in our area recently.
The police have been round advising schools about security and equipment marking. They've recommended two products, about the same, involving stenciling indelible paint. They are Selectamark and Idmark.
We've used black and UV 'security' pens but they rub off over time.
I've seen these products in previous work places before I worked in IT. They're ugly but the do the job.
Has anyone any ideas or recommendations on these two products?