Would this do good to seal a usb port with a usb cord plugged in?

Not sure why you need to seal a USB PORT but I see no reason it wouldnt keep it waterproofed.

Is this stuff good for polyureathane bushings

Yes it is good for polyurethane bushings.....the lube they sell for the bushings is essentially rebranded dielectric grease too.

Has anyone tried this on fishing reel components? Is it light enough?

Definitely! I've been using it from 15 yrs or more... The main purpose, to seal the reel and protect screws from salt; for those that are not stainless I fill the hole with the grease to the top well, every where there is a screw head facing out. And all around the edge and bound surface of the gear cover, anywhere water can sip in! And in the gears, but I would mix it with other type to soften a bit for smooth reeling experience.

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🛠️ Seal the deal with the grease that keeps your gear flawless!

TRUSTED AMERICAN QUALITY - Crafted in the USA to the highest industry standards, delivering premium performance you can count on.
ULTIMATE WATERPROOF SEAL - Blocks out salt, dirt, and moisture to protect your electrical and mechanical parts from corrosion and oxidation.
PRECISION APPLICATION BRUSH - Built-in angled brush reaches every corner of the jar for mess-free, exact application every time.
EXTREME TEMPERATURE RESILIENCE - Performs flawlessly from freezing cold to scorching heat, ensuring reliability in any environment.
VERSATILE MULTI MATERIAL COMPATIBILITY - Safe and effective on metal, rubber, and plastic—perfect for automotive, marine, and electrical applications.

Mission Automotive’s 8 oz. Dielectric Grease is a premium synthetic silicone paste designed to waterproof, lubricate, and protect electrical and mechanical components. With a temperature range from -55°F to 570°F, it prevents corrosion, oxidation, and voltage leaks across metal, rubber, and plastic surfaces. Featuring a built-in angled applicator brush for precise use, this American-made marine grease is the go-to solution for automotive, marine, and electrical maintenance.

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Material	Silicone
Brand	Mission Automotive
Package Information	Jar
Liquid Volume	237 Milliliters
Item Weight	8 Ounces
Recommended Uses For Product	Car,Electrical,Windows
Upper Temperature Rating	5.7E+2 Degrees Fahrenheit
Flash Point	5.7E+2 Degrees Fahrenheit
Item Form	Paste
Manufacturer	Mission Automotive
Unit Count	8 Ounce
UPC	638037142402
Number of Items	1
Item Weight	8 ounces
Package Dimensions	4.7 x 2.47 x 2.4 inches
Item model number	8542064566
Is Discontinued By Manufacturer	No
Manufacturer Part Number	08946

Dielectric Grease/Silicone Paste/Waterproof Marine Grease (8 Oz.) Made in USA

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