is this stuff good enough to be under water buy itself on steel post with no paint

I don't know, but my guess is probably. I'd go to the Interlux website and do some research. If you decide to try it, know that it is very sensitive to temperature during application. When you are on their site, check for the appropriate thinner depending on your climate.

Sq footage of one quart?

I have twin outdrives and primed both with about half a quart.

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Description

⚓ Dive into corrosion-free confidence with Primocon!

QUICK DRY EFFICIENCY - Achieves full cure in just 24 hours with a surface dry time of 3 hours—get back on the water faster.
RUST RESISTANT ARMOR - Advanced enamel formula creates a durable barrier against rust and harsh marine elements.
TRUSTED BRAND RELIABILITY - From Interlux, a leader in marine coatings, ensuring your investment is protected with proven technology.
PROFESSIONAL GRADE COVERAGE - One quart covers critical areas with a smooth, glossy grey finish that signals quality and durability.
ULTIMATE UNDERWATER PROTECTION - Specifically engineered for submerged metal surfaces to prevent corrosion and extend boat life.

Interlux Primocon Underwater Primer is a rust-resistant, enamel-based metal primer designed for underwater boat maintenance. It offers a fast 3-hour dry time and full cure within 24 hours, providing a durable, waterproof, glossy grey finish that protects metal surfaces from corrosion in harsh marine environments.

Specifications

Brand	Interlux
Color	Grey
Finish Type	Gloss
Size	32 Fl Oz (Pack of 1)
Item Volume	1 Quarts
Special Feature	Rust Resistant
Unit Count	32 Fluid Ounces
Paint Type	Enamel
Specific Uses For Product	Underwater boat maintenance, corrosion prevention
Surface Recommendation	Metal
Indoor/Outdoor Usage	Outdoor
Item Form	Aerosol
Is Waterproof	True
Model Name	Primocon Underwater Primer
Package Information	Can
Color Code	#9B9B9B
Full Cure Time	1 Days
Coverage	1
Water Resistance Level	Waterproof
UPC	081948403603
Global Trade Identification Number	00081948403603
Manufacturer	Interlux
Dry Time In Hours	3
Item Weight	2 pounds
Product Dimensions	8.5 x 12.5 x 5 inches
Item model number	3006.3677
Exterior	Metal
Manufacturer Part Number	YPA984/QT
Special Features	Rust Resistant

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