How to make a Harry Potter lighting scar?

A grandson will go as Harry Potter.
I would like to make a scar to spirit gum to his forehead.

As a kicker I plan to put an smd LED under the appliance.
Powered by a flat cell in the hair and fine magnet wire for conductors.

So far I was planing to use a glue gun to form the scar on a tin can
for simulated forehead curved shape..

Any suggestions on a better material or kit will be greatly appreciated !

artworker4 years ago
You can try glow in the dark paint! If it is strong enough, it will also work in low light.
iceng (author)  artworker4 years ago
Good idea, simple to do !
I will ask his mom if we can use the fluid from a red glow stick on his forehead.
iceng (author) 4 years ago
Thanks all....
Went and bought a scar kit on Amazon.