Can this be refilled from a tub?

Yes it can, but its a little sloppy. I have found that the best way to refill TG-01's is with a TG-12 cartridge if you need that much Tef-Gel

Can this be used on steel bolts going into aluminium? I was going to use copper antiseize but was warned about galvanic corrosion.

Yes, preventing galvanic corrosion between steel and aluminum is one of the most widely used application for ULTRA Tef-gel . Boat manufacturers and repair shops use it consistently for this purpose.

This product has pfas?

The Caution portion of the Application section states 'Contains Fluorocarbon polymer' or PTFE not PFAS. PTFEs are in everything from laptops, Cell phones, etc... Also states use gloves with use.

This product is described as "anyi-gull". Is that supposed to be "anti-gall"? Or what?

Anti-gall is correct. Great product to prevent galling.

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Ultra Tef-Gel

Product ID: 513550772

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⚓Marine-grade PTFE lubricant

💧Waterproof anti-corrosion formula

🔩Anti-seize thread protection

Description

⚓ Keep your marine gear smooth sailing with Ultra Tef-Gel!

SMOOTH THREAD ACTION - Non-hardening anti-seize compound ensures effortless assembly and disassembly of threaded parts.
WATERPROOF DURABLE - Engineered to resist saltwater, detergents, and harsh conditions for long-lasting protection.
ULTIMATE MARINE DEFENSE - PTFE-based formula guards against corrosion, rust, and galling in saltwater environments.
EXTEND EQUIPMENT LIFESPAN - Prevents metal-to-metal contact, reducing friction and wear on critical marine hardware.
TRUSTED IN TOUGH CONDITIONS - Relied on by professionals for reliable performance on boats, yachts, and dock equipment.

Ultra Tef-Gel is a premium PTFE-based marine lubricant and anti-seize compound designed to protect metal components from corrosion, rust, and seizing in harsh saltwater environments. Its waterproof formula ensures long-lasting lubrication and easy maintenance of threaded connections, making it essential for marine hardware longevity and reliability.

Specifications

Manufacturer	Ultra Tef-Gel
Brand	TEF-GEL
Product Dimensions	15.24 x 10.16 x 2.54 cm; 28.35 g
Item model number	TG-01
Manufacturer Part Number	TG-01
Item Weight	28.3 g

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