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

Product ID: 319352955

Details

Brand
OBSESSED
Colour
Green
Finish type
Clear
Item volume
946.35
Size
946.352946

🎨Enhances paint adhesion for longer-lasting finish

📏Covers up to 146.4 sq ft per bottle

🛡️Rust resistance with chemical transformation

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4113132₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Turn rust into resilience — paint-ready perfection in every drop!

VERSATILE INDOOR OUTDOOR USE - Perfect for all metal surfaces, whether inside your workspace or exposed to the elements.
MAXIMIZE YOUR PAINTS LIFESPAN - Creates a secure bond for paint, preventing moisture and oxygen from degrading metal underneath.
TRUSTED BY THOUSANDS WITH 4 7 ⭐ - Highly rated by professionals and DIYers alike, ensuring reliable performance every time.
TRANSFORM RUST INTO A TOUGH SHIELD - Chemically converts rust into a hard, priming-ready surface that stops corrosion in its tracks.
EFFORTLESS APPLICATION SUPERIOR COVERAGE - Water-thin formula spreads easily and covers more area than traditional rust treatments.

Ospho 605 Metal Treatment is a high-performance rust converter that chemically transforms rust into a durable, paint-ready surface. With a water-thin formula covering approximately 146.4 square feet per bottle, it enhances paint adhesion and extends the life of metal finishes. Suitable for both indoor and outdoor metal surfaces, this trusted product boasts a 4.7-star rating from over 1,700 users, making it a must-have for corrosion protection and metal restoration.

Specifications

ASIN	B000C02CDG
Age Range Description	Teen
Best Sellers Rank	#46,197 in Automotive ( See Top 100 in Automotive ) #75 in Care Corrosion & Rust Inhibitors
Brand	OBSESSED GARAGE
Brand Name	OBSESSED GARAGE
Color	Green
Color Code	#008000
Colour	Green
Container Type	Bottle
Coverage	146.4 Square Feet (as an estimate)
Customer Reviews	4.7 out of 5 stars 1,746 Reviews
Dry Time In Hours	24
Finish Type	Clear
Finish type	Clear
Full Cure Time	2 Hours
Global Trade Identification Number	00757533006053
Included Components	Paint & Stains, Painting Supplies, house-primers
Indoor Outdoor Usage	Indoor
Is Waterproof	False
Item Form	Liquid
Item Volume	946.35 Milliliters
Item Weight	2.7 Pounds
Item volume	946.35 Milliliters
Model Name	Series
Model Number	605
Paint Type	Specialty
Part Number	605
Size	946.352946 milliliters
Special Features	Rust Resistant
Special features	Rust Resistant
Specific Uses For Product	Metal
Surface Recommendation	Metal
UPC	757533006053
Unit Count	1.0 Count
Water Resistance Level	Not Water Resistant

Reviews

D**D

love this stuff, works great

20.04.2026

R**R

Good stuff

1.08.2025

T**E

Worked Well Removing Rust & Road Grime from Stainless Steel Exhaust

4.02.2026

B**L

Does what it is supposed to do

1.04.2026

M**L

Worked like a charm on my rusty Tacoma

20.04.2026

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