M-645 Float Coat


M-645 is a float coat used to inhibit corrosion in vessels containing saltwater or brine. It floats on the surface of the water, forming a self-healing protective film on adjacent metals. M-645 is ideal for ballast tanks that are frequently emptied and refilled and hydrostatic testing applications.


The film displaces water containing chlorides from the surface of the vessel. As the water is raised or lowered, M-645 coats every square inch of the vessel’s interior— including ring stiffeners, girders, piping, and side shells—with a sufficient amount of product to protect against corrosion. Because M-645 floats on the surface of the water, the non-aqueous formula does not contaminate ballast water, allowing for normal discharge procedures. It is also an effective corrosion inhibitor for hydrotesting large aboveground storage tanks (ASTs). The product is non-hazardous, non-flammable, and self-reapplying. M-645 extends ballast tank life, minimizing costs for dry docking repairs, and does not interfere with ballast water discharge. It is effective for multiple tank refills. M-645 is available in 5-gallon (19 L) pails, 55-gallon (208 L) metal drums, liquid totes, and bulk.


Typical applications include:

• Hydrostatic testing of pipelines, vessels, and ASTs

• Seawater ballasting of ships, buoys, and oil rigs

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