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 Dielectric Silicone Paste Waterproof Marine Grease (8 Oz)

Product ID: 223792514

Details

Brand
MISSION
Item Weight
8 Ounces
Liquid Volume
226.8
Material
Silicone
Package Information
Tube

💧100% Waterproof Seal

🔥570°F High Flash Point

🇺🇸Proudly Made in USA

Description

⚡ Seal the deal with the grease that keeps your gear dry and running smooth!

GENEROUS 8 OZ TUBE - Ample quantity for multiple applications, perfect for professionals and DIY enthusiasts alike.
TRUSTED BY THOUSANDS - Rated 4.8 stars by nearly 5,000 users—join the community that won’t settle for less.
HIGH TEMPERATURE RESILIENCE - Withstands extreme heat up to 570°F, ensuring reliable performance under pressure.
ULTIMATE WATERPROOF PROTECTION - Keep your marine and electrical parts corrosion-free even in the harshest wet conditions.
SILICONE BASED DIELECTRIC FORMULA - Non-conductive paste that guarantees flawless low-voltage connections every time.

MISSION AUTOMOTIVE Dielectric Silicone Paste is an 8 oz waterproof marine grease designed to protect and lubricate electrical and marine equipment. Made in the USA, it features a high flash point of 570°F and a silicone-based dielectric formula that prevents corrosion and ensures optimal low-voltage performance. Highly rated by thousands, it’s the go-to choice for professionals demanding durability and reliability.

Specifications

ASIN	B016E5E59G
Brand Name	MISSION AUTOMOTIVE
Container Type	Tube
Country of Origin	USA
Customer Reviews	4.8 4.8 out of 5 stars (4,798)
Flash Point	570 Degrees Fahrenheit
Item Form	Paste
Item Weight	8 Ounces
Liquid Volume	226.8 Millilitres
Manufacturer	MISSION AUTOMOTIVE
Material Type	Silicone
Model Number	8542064566
Number of Packs	1
Part Number	08946
Recommended Uses For Product	marine equipment, electrical components
Specific Uses For Product	Prevent Corrosion, Lubricate in Marine Environments
UPC	638037142402
Unit Count	236.59 Milliliters

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