Hi All;
Whenever filling anything laser engraved other than wood, I use acrylic based craft paints which are very inexpensive and come in a ziilion colors-yeah, really. They work great on plex and other plastics and clean up with water.
For wood plaques, etc with finished surface I also use the acrylic. For unfinished wood, mix a little Elmer's paste wood filler (in a tube, not can) with whatever color acrylic paint you want, flood it on, let it dry and sand it flush.
George

I am doing some paint filling now, on plastic objects. Does anyone seal over the paint fill when done, something to protect the paint fill? Wanting to make sure the paint fill stays in place and lasts well. Maybe it does without any sealer? I have not done much paint fill, so not sure if it is everlasting!

Also, thanks for the paint flood filling method, I had not thought or tried that! :-) 

Thank you,

I figured that, but was not sure. Thanks for the reply so quickly! :-) 

I was always hesitant about doing paint fill, but this method seems to be so much easier then I thought. Thanks again,