Kotelnikov Pavel N.  — artist-restorer of the highest category of metal works; The State Research Institute for Restoration, head of the department of scientific restoration of metal works
E-mail: 113metal@gmail.com

Kurakov Sergey V.  — Researcher engineer; Bauman Moscow State Technical University, Engineer I cat. of Museum
E-mail: kurakov@bmstu.ru

Makarova Anastasia S. — PhD. cult., restorer of the I cat.; the State Research Institute for Restoration, Academic Secretary
E-mail: aanpilogova@mail.ru

Samoilov Vladimir B. — Bauman Moscow State Technical University, associate professor of the Department of Materials Processing Technologies
E-mail: wladsam@mail.ru

This article addresses the determination of the applicability limits and efficacy of modern spraying technologies for the restoration of metal artworks exposed outdoors. The study presents a comprehensive analysis of the Cold Gas-Dynamic Spraying (CGDS) method, encompassing its development history, technological features, potential, and modern applications. The practical research is focused on the outdoor sculpture located in Moscow and Saint Petersburg that was restored using this cold spraying method. A detailed laboratory study was conducted on coating samples taken from the federally significant cultural heritage objects — the allegorical zinc-alloy sculptures “Water” and “Earth” (by V. I. Mukhina, N. G. Zelenskaya, A. M. Sergeev). A set of analyses, including on-site visual inspection, metallography, and electron microscopy, was performed to assess the current state of the studied coatings, their adhesion, microstructure, and to identify the primary degradation mechanisms. As a result, the key advantages and disadvantages of the CGDS method in restoration practice have been systematized, and practical recommendations for its application in preserving monumental metal sculpture have been developed. The findings are of significant applied value for selecting optimal technologies, designing restoration processes, and addressing damage to metal cultural heritage objects in aggressive outdoor environments. The article presents work carried out within the framework of a scientific topic (registration number NIOKTR 124031100828-6), implemented at the expense of the federal budget in 2025.