Select a segment of a cylinder

[arradoy]

How to select a segment of a cylinder (or cone) for painting only this segment ? Thanks for answer

[TIG]

View > Hidden Geometry == ON
Shows the smoothed edges between faces... which then allows you to select/edit/erase/paint etc individual facets forming a surface, which would otherwise appear continuous when View > Hidden Geometry == OFF...

[arradoy]

Yes, Yes, Yes.... many thanks!