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Old 09-01-2018, 03:28 PM   #1
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Floor process help!

Is Ospho okay to use as a primer on our galvanized floor? Or do I still need to prime the floor with something before I put Rustoleum down (which obviously can't be used on galvanized floor) - Ospho isn't gonna magically make it not galvanized anymore.... so I assume I would still need a primer.

We have very minimal rust areas. Just a little on Windows, wheel wells, and a small patch up front. Mainly surface rust...so I'm not even sure we need to use Ospho on the whole floor unless it's a primer for the rustoleum because we need more of a preventative than a converter.

The whole floor process has confused me because I hear so many different opinions and then second guess myself.

What's the best process? Help!
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Old 09-01-2018, 04:24 PM   #2
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GALVANIZED - where appearance is important, apply one coat of OSPHO, let stand for approximately thirty minutes or until metal is etched. Flush with water, avoiding damage to adjacent areas; or wipe to a smooth finish, let dry, then paint. Where appearance is not important, one coat of OSPHO is recommended to thoroughly coat and etch the metal. Let stand overnight or until completely dry. Brush off any loose powder before painting.


A typical paint application will last much longer after an application of OSPHO because subsequent paint coatings attach themselves so tightly that moisture and oxygen cannot attack the metal. OSPHO is water-thin, and therefore goes on easily and covers a larger area than paint. One gallon covers approx. 600 square feet. Historically, best results have been achieved using an oil-base primer and topcoat. Test a trial sample before using under epoxy or latex-base paint applications. OSPHO is equally effective for exterior and interior work alike and is highly recommended as a pre-treatment coating by leading paint manufacturers.


For best results, use OSPHO at temperatures no lower than 36 degrees F. Excessive dew and humidity may prolong drying time and cause powdery buildup.


Spray equipment should be flushed out with water after using. Clean brushes with water. Avoid getting OSPHO on adjacent areas such as painted surfaces, concrete, masonry and stonework. If splashing occurs, flush immediately with water to remove.


WARNING: OSPHO contains phosphoric acid. KEEP OUT OF REACH OF CHILDREN. If taken internally give large quantities of milk or water. Call physician. Avoid contact with eyes. In case of contact, flush with water. Prolonged exposure to skin may cause irritation - use rubber gloves or other forms of skin protection.
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Old 09-01-2018, 04:26 PM   #3
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The short answer is: you don't have to prime but it will likely wear better if you do.
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