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if you extruded it in the model, you could change the surface color.

if you create it as a cosmetic sketch with xhatch, then when you get to the drawing, you can close the spacing of the hatch

ron

Bodgan,

Did the information from Ron help you?

Another option which you can try (it will not be a complete solution) is adding x-hatching in the sketch.

Create a sketch > Redefine the sketch > Sketch setup > Properties tab > Check add cross hatching > Add minimum spacing and finish. There is no fill option for sketch hence this may give you close results.