I've done that a couple of times myself and it can be a lot of fun and also very frustrating when you look at the final image only to see you have one number/letter when it's back to front :bang:
We are fortunate MATT is very easy to light write
Matt
MWHCVT
What sort of torch are you using? I tried with an LED torch which is crazy bright and it didn't work too well. How do you remember where each letters are, I end up writing over the top lol.
Very good.