Well i stil have to make it deeper, but Im going in the right direction. I have failed many, many times .In fact everything what can go wrong did go wrong.Thanks to guy named Rista which I thank, from one of knife forums in my country i tried with etching which he nicely described, but it was not so easy as i said. Everething is has to be neat, nice and clean, or it be fail.It can be done with 1,5liters of water, about 15 spoons of salt which you dissolve in water and car battery charger(mine is 5A). But first you start with Corel draw and make some logo or makers mark or some fun things or letters. Remember you need negatives,not like me when you cought yourself that you actually read something that shoukd be mirror like and then its $#!!^^^^.You can or cut your marks on the cutter(plotter) and then remove the parts you dont want with the needle.You transfer the foil on some steel surface which you cleaned very thoroughly so the foil can be in good contact with surface or else ...So th esurfac witc not be etched should be protectedwith foil or you can use the nail polish and thaqn scratch the drawing but i couldnt do that.I used the blue press and peel foil for electronics wwhich you print with ordinary printer in the highest resolution on the matt side.(Do not print om shiny side) I hear that you can do that with any shiny paper instead. Than printed side you put on the steel polished surface and iron that whith iron.After or 1 minute or 10 depending on the temperature you can remove the foil after quenching under water.You can see that on picture.On the one side you put a bolt which is conected to charger and the other wire should be connected to working part.Both parts are submerged in the plastic container with salt solution.When you turn on the charger the bolt should make bubbles .If not switch the wires (polarization). It needs about an hour or so to finish etching or if you use mobile phone charger- much longer.When its working you will see black sludge as the result of etching(see the picture)When its finished wash good.
Still, I like it. 
Epoxy seems like it would work well though. Maybe try the block dye method to apply a resist to the surface so that any unwanted epoxy might be easy to remove. That or fill the holes then block sand the surface. 
