Maintaining the original patina and finish of metal sculptures presents unique preservation challenges that artists and collectors must address. The most common issues include environmental corrosion from rain, humidity, and pollution which accelerate oxidation. Temperature fluctuations cause metal expansion and contraction, leading to micro-cracks in protective coatings. Improper cleaning methods using harsh chemicals can strip away delicate patinas developed over decades. Biological growth like moss or lichen creates uneven discoloration while simultaneously trapping moisture. Perhaps most challenging is balancing preservation with authenticity - overzealous restoration often destroys the valuable historical character that patina represents. Professional conservators recommend regular dusting with soft brushes, applying specialized wax coatings, and maintaining stable humidity levels between 40-50%. For outdoor sculptures, strategic placement away from sprinklers and annual inspections for early corrosion signs are crucial. The patina's preservation ultimately depends on understanding the specific metal alloy composition and respecting the natural aging process that gives each sculpture its unique character.