Yes, Indonesias Palimanan Sandstone can be used for exterior applications in very humid climates. Palimanan Sandstone is known for its high durability and water resistance, making it suitable for outdoor use even in high humidity environments. It has been used in various construction projects in Southeast Asia, including facades, paving, and landscaping, where the climate can be extremely humid. The stone is able to withstand moisture and is not prone to cracking or erosion, making it a popular choice for exterior applications in such climates. However, it is always recommended to consult with professionals and follow proper installation and maintenance guidelines to ensure the longevity of the stone in any specific environment.