Laser engraving
My hand writing is terrible, so I laser engrave all my work .
I burn it in deep and make sure I DONT WIPE OFF the black burnt ash.
I have never done this on acrylic ( I try not to ever use the stuff )....
On wood or bone even leather it works great, I put a clear coat over the top of the engraving until everything is smooth or flush.
Because I don't work with plastics allot and its all bone and wood I am very careful if I was to use any kind of filler a make sure it will NOT BLEED INTO THE WOOD OR BONE.