how many 1 Quart Bottles would I need to cover 80 ft. of Pipe Iron Fencing? Would it be best to buy by the Gallon?

You could use a pump sprayer, but a brush also works and there isn't any overspray. A little goes a long ways in my experience. It depends on the square footage of your fence and how bad the rust is, but I wouldn't start with more than 2 quarts. It turns the treated areas white, so you may want to paint it, but it works great.

would this work removing rust off atv?

As long as the metal is iron based, it should work fine. Not sure how well it would work on aluminum or other base metals. Some atv's are made to be lightweight, so it might be aluminum. Get a magnet an check to see if it sticks to the body.

I bought a house and the previous owner painted the flashing around the hosuse. There is no rust but paint is peeling off, will this work for me

This will not work for you. The reason the paint is peeling is because the flashing is probably galvanized. What you need to do is etch the flashing. You do that by washing it down with vinegar. Let it sit for one day, then wash it off with water, once it is dry it is ready for paint. Rustoleum, used to sell a primer for this, but it was no good. I have not seen it in a while.

If I sprayed this on paint will it affect it? I have rust bubbling through.

I do not think this will have positive affects on the paint. It is an acid, and although it did not take the paint off of applications I applied it to, it did affect the paint, some flaked off, and what stayed on turned ash colored. If you plan on putting it on, then sanding and painting over the old paint there is no issues.

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Ospho 605 Metal Treatment New .

Product ID: 64271394

Details

Brand
OBSESSED
Colour
Green
Finish type
Clear
Item volume
946.35
Paint type
Specialty
Size
1 count (Pack

🧪Corrosive acid-based formula

⚙️Covers up to 146.4 sq ft

🛡️Rust-inhibiting coating, not paint

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€ 67.92

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In stock

Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Turn back time on rust—because your metal deserves a second chance!

BROAD SURFACE COVERAGE - One quart treats up to 146.4 square feet, maximizing your maintenance budget.
CLEAR FINISH NO PAINT - Invisible rust barrier that preserves the original metal look—no repainting needed.
EFFORTLESS RUST DEFENSE - Transforms light rust without sanding—just clean loose debris and apply.
PRO LEVEL METAL REVIVAL - Trusted by automotive enthusiasts to restore and protect high-value metal parts.
POWERFUL ACID NEUTRALIZATION - Use with alkaline detergent post-application for safe, effective cleanup.

Ospho 605 Metal Treatment is a potent rust converter and inhibitor designed for exterior metal surfaces. It chemically transforms light rust into a stable, protective coating without the need for sanding or repainting. With coverage of approximately 146.4 square feet per quart, it’s ideal for automotive, industrial, and home maintenance projects. Note: it is corrosive and requires careful handling and neutralization after use.

Specifications

ASIN	B000C02CDG
Age Range Description	Adult
Best Sellers Rank	38,125 in Automotive ( See Top 100 in Automotive ) 174 in Rust Converters & Rust Removers
Brand Name	OBSESSED GARAGE
Colour	Green
Colour Code	#008000
Container Type	Bottle
Coverage	146.4 Square Feet (as an estimate)
Customer Reviews	4.7 4.7 out of 5 stars (1,748)
Dry Time In Hours	24
Finish Type	Clear
Full Cure Time	2 Hours
Global Trade Identification Number	00757533006053
Included Components	Paint & Stains, Painting Supplies, house-primers
Indoor Outdoor Usage	Outdoor
Is Waterproof	False
Item Form	Liquid
Item Volume	946.35 Millilitres
Item Weight	1.23 kg
Manufacturer	THE SKYBRYTE COMPANY
Model Name	Series
Model Number	605
Paint Type	Specialty
Part Number	605
Size	1 count (Pack of 1)
Special Features	Rust Resistant
Specific Uses For Product	Exterior
Surface Recommendation	Metal
UPC	757533006053
Unit Count	1.0 count
Water Resistance Level	Water Repellent

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