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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Mission Automotive Silicone Dielectric Grease Paste - Voltage Protection & Electrical Grease - 8 Oz, Made in USA

Mission Automotive Silicone Dielectric Grease Paste - Voltage Protection & Electrical Grease - 8 Oz, Made in USA

Product ID: 19409154

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Details

Material
Silicone
Brand
Mission
Package Information
Jar
Liquid Volume
237
Item Weight
8 Ounces

⚡Voltage leak prevention

💧Waterproof sealing

🖌️Precision applicator brush

Description

🛠️ Keep your ride shockproof and corrosion-free—because your car deserves the best!

VOLTAGE LEAK STOPPER - Prevents electrical shorts and power loss for reliable performance every drive.
PRECISION APPLICATION - Included brush ensures seamless, mess-free coverage exactly where you need it.
ALL WEATHER DURABILITY - Withstands extreme temperatures up to 570°F, built to last through every season.
ULTIMATE CORROSION DEFENSE - Robust waterproof silicone paste protects your vehicle’s electricals from winter’s worst.
MULTI USE AUTOMOTIVE ESSENTIAL - Perfect for spark plugs, brake caliper pins, and rubber gasket preservation.

Mission Automotive Silicone Dielectric Grease Paste is an 8 oz silicone-based electrical grease designed to provide waterproof sealing and prevent voltage leaks in automotive and marine environments. Made in the USA, it features a precision applicator brush for easy use and withstands temperatures up to 570°F, making it ideal for winter maintenance and year-round vehicle protection.

Specifications

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

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