Marine 31 Stainless Steel Liquid Sealant Made in USA Marine 31 Stainless Steel Liquid Sealant is harbor-safe and eco-friendly. Marine 31 Stainless Steel Liquid Sealant can be applied to: Stainless steel, Chrome, Aluminum Clear coated surfaces and Diamond Plate Marine 31 Stainless Steel Liquid Sealant imparts a durable, clear protective coating that withstands the elements for up to 6 months. This special polymer is designed to form a durable, cross-linking bond to stainless steel, aluminum and chrome surfaces, protecting them from the elements that a boat is exposed to, both on land and water.