Must the rust be removed? How does this differ from Ospho?

Hello Billy, Thank you for your interest in our products. Surface must be clean and you should remove all scale; loose and flaking material. Please prepare surface as per instructions on the product page information. Marine Oil is a rust inhibitor where as Ospho is a rust converter. Unlike Marine Oil which penetrates the rusted surfaces driving out any moisture and air and filling the rust pores with oil, which then dries to form a strong, stabe and flexible finish, Opsho works by chemically changing the rust to a black non-rusting layer known as magnetite. Marine Oil is non-hazardous, safe to use in enclosed spaces and will not react with any metal, unlike Ospho. Also because it works with the rust rather than trying to convert it, it offers a much stronger and more stable surface to apply a topcoat to. Hope it helps, The Owatrol Team

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Item Package Dimensions L x W x H	5 x 4.5 x 4.5 inches
Package Weight	2.2 Pounds
Brand Name	OWATROL
Color	Clear
Number of Items	1
Manufacturer	Owatrol
Part Number	033US
Size	1,06 US Quarts (1 liter)

OWATROLMarine Oil Metal Rust Inhibitor & Paint Conditioner - Deep Penetrating Rust Inhibitor for Metal Boats, Improves Paint Flow, Prevents Peeling, Safe on Hulls, Tanks

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