The more layers the brighter the glow.
But you have to paint your object white (either with white primer or white paint) first.
And then use the glow in the dark paint on top of that.
You have to have a little patience and do it right if you want it to work.
I have used this paint and it is good, but the last can I used did not glow in the dark, which I found out after using.
It does not glow.
This stuff did not work!
It is really a clear coating that needs to go over a lighter color.
Didn't give a good coat .
Didn't work at all.