Yes, Indonesia Red Andesite can be used for exterior applications in very humid climates. Red Andesite is a type of volcanic rock that is known for its durability, strength, and resistance to weathering. It is commonly used for outdoor applications such as paving, wall cladding, and landscaping. The rocks natural composition and structure make it highly resistant to moisture, which makes it suitable for use in humid climates. However, proper installation and sealing techniques should be followed to ensure optimal performance and longevity in such conditions.