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Hubbard-Hall’s Metal Guard 678 is a clear resin coating rust preventative, which has been formulated to give effective protection to a wide range of metal surfaces, where additional durability and protection are required, especially on lightly oiled metal surfaces. It provides a high-gloss and dry hard film with excellent humidity resistance. It gives performance similar to that of solvent-based coatings, but without the fire hazard. Metal Guard 678 can also be used for exterior applications, giving protection against rust for 3 to 6 months depending upon conditions, and it is suitable for preventing white rust on galvanised parts. An emulsion of milky appearance, the solution can be diluted with tap water to give, if required, a thinner less durable film and it can be applied by immersion or brush painting. Touch-dry time is around 10 minutes, at 24C/45% humidity – forced ambient air and/or dilution will reduce this time. Metal Guard 678 is ideal for masking those steel parts which will be black oxide coated, it will prevent the blackening of masked areas where hot alkaline black oxide solutions, or acidic room temperature solutions are applied.