how is this different from a rust converter

It is not different. It IS rust converter. Extend is the Loctite brand name for its rust converter.

My frame has tiny spotted/speckled rust areas. Will this product still adhere okay with paint inbetween the many rust spots?

It worked fine for me and I had a similar situation. If the area is not too big, you could just sandpaper it, then put the loctite stuff on and paint it later.

The description says it's an aerosol, but the picture looks like a bottle. Which is it?

Judith,The Locktite product that I have purchased are the small bottles with applicator brushes for delicate work. I have no experience with the 235285 product. I would say just by looking at the picture that it is not an aerosol. I hope you find a definite answer from someone who has actually purchased the Henkel 235285 product. Good luck! The product which I use (small bottle with applicator brush does a good job.

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Loctite Extend Rust Neutralizer

Product ID: 7461131

Details

Brand
Loctite
Color
Black
Finish Type
Brushed
Included Components
Surface
Is Waterproof
False
Item Form
Liquid

⏱️Fast 20-min set time

🖌️Paintable black finish

🛠️Works on iron & steel

$50

Duties & taxes included

In stock

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Description

🛡️ Stop Rust in Its Tracks — Repair, Don’t Replace!

TRUSTED LEGACY - Backed by 55+ years of Loctite innovation, ensuring reliable protection and performance every time.
RAPID RUST CONVERSION - Transforms rust into a durable, paint-ready black surface in just 20 minutes per coat.
EFFORTLESS APPLICATION - Milky white latex formula applies smoothly, creating a tough polymer barrier against future corrosion.
UNIVERSAL METAL SAVIOR - Perfect for iron railings, grills, pipes, cars, and more—revive your metal assets effortlessly.
PROFESSIONAL GRADE FINISH - Acts as a primer compatible with oil or lacquer-based paints for a flawless, long-lasting restoration.

Loctite Extend Rust Neutralizer is an 8 oz fast-drying liquid that chemically converts rust on iron and steel into a neutral black surface, ready for painting. Ideal for homeowners and professionals, it protects and primes metal surfaces like grills, railings, and automotive parts, setting in 20 minutes and delivering a durable finish that extends the life of your metal investments.

Specifications

ASIN	B001000VS0
Best Sellers Rank	#23,873 in Automotive ( See Top 100 in Automotive ) #109 in Care Corrosion & Rust Inhibitors #1,068 in Oils & Fluids
Brand Name	Loctite
Color	Black
Container Type	Bottle
Customer Reviews	4.6 4.6 out of 5 stars (1,986)
Dry Time In Hours	0.33
Finish Type	Brushed
Full Cure Time	24 hours
Global Trade Identification Number	00079340811386
Included Components	Surface Treatment
Is Waterproof	False
Item Form	Liquid
Item Type Name	Surface Treatment
Item Volume	8 fluid ounces
Item Weight	10.24 ounces
Manufacturer	Henkel
Model Name	LOCTITE
Model Number	1381192
Part Number	1381192
Size	8 Fl Oz (Pack of 1)
Special Features	Fast-Drying
Surface Recommendation	Metal
UPC	079340811386
Warranty Description	No warranty

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$50