I am doing an engraving project which requires me to fill small lettering in black.?

Question

Anyone know any good filler that can be used on Nylon/Plastic?

Answer 1

I am assuming you are filling in the etched part

So if you paint (use water based acrylics) over the etched part = can you quickly rub the excess paint off the plastic so it remains in the etched letters and wipe the plastic clean

try a sample first = dont use too much water = you dont want to have it run in the etched letters.  Maybe a damp sponge. Maybe if you do a little section at a time you can get it off before it sets so you dont have to scrape the plastic.

Answer 2

A fine black Sharpie might work.

Black nail polish?