Experiments:

I love to try things out to learn things.  I am still trying to figure out how to make a brown cowboy hat black.  I can purchase more fabric spray paint,  nope.  Or I can try normal black spray paint.  I am afraid to ruin the one hat I have. But I feel the hat is made of something similar to felt.  I have spare felt.  So I spray painted some fabric,  so see what happens.

If you can,  figure things out in small scale,  before moving to a larger scale.  Or before ruining your only one.