I use my wood burning tool on a lot of my carvings to high light hair and beards and to make lines to define areas. As well as design features. You are right that almost every thing will fade in sun light in time, burn and paint. With burning it will depends on how dark the burn and the wood. If I am doing a decretive stick or cane I do not worry to much about it.They hang on walls or are in cane stands and do not see much sun. If it is a daily use stick or cane or will be use out side for hiking I use spare urethane or marine tung oils. They are made with UV protection for the wood. I have refinished a few sticks after a number of years of use. But do not remember ever having to reburning any of them.