I do it completely ordinary .... every "product" bears my signature .. in stonework I have the initial letters ... on the underside of the product ... (I do not mean every plinth.: D just big things) If it is about construction of a house, etc ... used to be the custom of building the names of those who did there with the date when it started, plus some protection symbols .. so I continue to do so .. Some customs are not completely stupid ... As for painting work ... so I always paint a small oak leaf (in a hidden place) ... it's just a custom ... D I'm a stonemason .. so it would be weird .. if I didn't mark things ... ☢ ☠ ☣ ☠ ☣ ☠ ☣ ☠ ☢