Best Single Use Dielectric Grease (2026)

A spark plug boot that sticks, a battery terminal with green corrosion, and a trailer connector that drops out on a wet road all point to the same small job, and the best single use dielectric grease seals those connections against moisture and corrosion. This guide compares 5 dielectric greases by pack size, tube size, named applications and shelf life.

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Picks for the garage

#	Product	Shop Score	Buy
1	Loctite 37535-6PK Dielectric Tune-Up Grease	9.5/10	Buy on Amazon
2	FOTU 707 2‑Pack Dielectric Grease for Auto	9.5/10	Buy on Amazon
3	Permatex 81150 Dielectric Tune-Up Grease	9.5/10	Buy on Amazon
4	AGS Automotive Solutions Dielectric Silicone	9.4/10	Buy on Amazon
5	CRC 05113-12PK Di-Electric Grease Power Dispenser	9.4/10	Buy on Amazon

1

Loctite 37535-6PK Dielectric Tune-Up Grease

Loctite·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

6 tubes of 2.7 oz dielectric tune-up grease with a moisture-proof barrier for spark plug boots and battery terminals.

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Pros

• 6 tubes of 2.7 oz for multiple jobs
• Moisture-proof barrier against salt, dirt and corrosion
• Prevents voltage leakage around electrical connections
• Named for spark plug boots, trailer hitches and battery terminals

Cons

• No warranty term is stated
• No shelf life is stated
• No NLGI grade is stated
• No dispenser or applicator is stated

2

FOTU 707 2‑Pack Dielectric Grease for Auto

FOTU·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

2-pack dielectric grease for auto, battery and spark plug connectors, NLGI #2 with a 5-year shelf life.

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Pros

• NLGI #2 with stable consistency from -55 to 570
• 5-year shelf life
• Formula gives continuous protection in harsh weather
• Listed for power cable joints, switch accessories and battery terminals

Cons

• No warranty term is stated
• Title says 2-Pack while the spec table lists NumberOfItems 1
• No temperature unit is stated for the -55 to 570 range
• No applicator is stated

3

Permatex 81150 Dielectric Tune-Up Grease

Permatex·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A small tube of dielectric tune-up grease that protects electrical connections and wiring from salt, dirt and corrosion.

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Pros

• Protects connections and wiring from salt, dirt and corrosion
• Prevents voltage leaks around any electrical connection
• Maker states it extends the life of bulb sockets
• Suggested for spark plug boots, trailer hitches and battery terminals

Cons

• Only 0.33 oz in the tube
• Warranty field states Warranty with no term
• No physical cover for the post itself
• Small tube suits small jobs, not many connections

4

AGS Automotive Solutions Dielectric Silicone

AGS·9.4/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

0.5 oz tube of dielectric silicone grease that meets OEM specifications, for sensor and ignition connections.

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Pros

• Meets OEM specifications
• Named for sensor, computer, solenoid and ignition module connections
• Shields against corrosion and water damage
• Easy to apply in a few seconds

Cons

• No warranty term is stated
• Only 0.5 oz per tube
• No shelf life is stated
• No NLGI grade is stated

5

CRC 05113-12PK Di-Electric Grease Power Dispenser

CRC·9.4/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

12-pack of 3.3 fl. oz dielectric grease power dispensers in an opaque white gel.

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Pros

• 12-pack of 3.3 fl. oz dispensers for shop use
• Power dispenser format
• Opaque white gel form
• 12 dispensers cover many jobs

Cons

• No warranty term is stated
• No applications are named in the bullets
• No shelf life is stated
• No NLGI grade is stated

Compared on paper

Specs such as CFM, PSI and torque are the manufacturer’s ratings as listed, collected 12 November 2026. Where a listing contradicts itself, each figure is shown.

How the points were given

Each grease is scored on performance, build, value, safety and warranty, with the weights published on the How We Pick page. None states a UL, ETL or CSA listing, so all score zero on safety, and none gives a clear warranty term.

Shop Scores range from a low of 9.2 to a high of 9.8, with each tool positioned by its weighted points proportionally, and more points always yields a higher score.

What the listings tell you

The 5 dielectric grease listings state little beyond pack size: only 1 stated a shelf life, only 1 stated an NLGI grade, and none stated a warranty term or a safety listing. One listing gave a title only, with no bullets and no spec table.

Buying guide: best single use dielectric grease

Pack size and tube size

Pack size is the first difference here. The CRC kit is a 12-pack of 3.3 fl. oz dispensers, the Loctite kit holds 6 tubes of 2.7 oz, the FOTU kit is a 2-pack at 4 oz, the AGS tube holds 0.5 oz, and the Permatex tube holds 0.33 oz. A single-use tube suits one job: a spark plug boot job or a battery terminal job. A 6-pack or 12-pack suits repeat jobs across a garage, with tubes on hand for the next connection that needs sealing.

Where it goes: spark plugs, battery terminals and connectors

Named applications separate the picks. The Loctite listing names marine and automotive electrical connections, spark plug boots, trailer hitches and battery terminals. The AGS listing names sensor connections, computer connections, solenoids, truck pigtails, plugs and ignition modules. The FOTU listing names power cable joints, switch accessories and battery terminals, plus spark plug connectors. The CRC and Permatex listings name no applications. For battery terminals in particular, see the best dielectric grease for battery terminals guide.

What the listing states about protection

Protection claims differ by listing. The Loctite listing states a moisture-proof barrier that lubricates and protects electrical connections from salt, dirt and corrosion, extends the life of bulb sockets, and prevents voltage leakage around electrical connections. The AGS listing states the grease shields against corrosion and water damage and meets OEM specifications. The FOTU listing states a formula that gives continuous protection in harsh weather, prevents corona discharge and eliminates arc. For the choice between a protector and a grease, see the battery terminal protector vs dielectric grease guide.

Shelf life and grade

Only the FOTU listing states a shelf life, at 5 years, and only the FOTU listing states a grade, NLGI #2, with stable consistency from -55 to 570. No other listing states a shelf life, a grade or a consistency range. The AGS listing states application takes only a few seconds, and the Loctite listing states the grease extends the life of bulb sockets.

Garage Fit Check

• A 12-pack of 3.3 fl. oz dispensers needs shelf space; the 0.33 oz and 0.5 oz tubes take up little room.
• No power is needed: every pick here is a hand-applied grease.
• Check the tube size before the job: 0.33 oz and 0.5 oz tubes suit a single job, while 6 and 12 packs suit repeat jobs.
• Check the shelf life: only the FOTU listing states one, at 5 years.
• Check the named applications: only the Loctite, AGS and FOTU listings name where the grease goes.

FAQ: garage tools

What is dielectric grease good for?

Dielectric grease protects electrical connections from moisture, salt, dirt and corrosion. The Loctite listing names marine and automotive electrical connections, spark plug boots, trailer hitches and battery terminals, and states the grease prevents voltage leakage around electrical connections.

How much dielectric grease to use?

The listings state no amount. The AGS listing states application takes only a few seconds, and the Loctite listing states the grease forms a moisture-proof barrier that lubricates and protects electrical connections.

How to use dielectric grease on spark plug?

The Loctite listing names spark plug boots as a typical application and states the grease prevents voltage leakage around electrical connections. The FOTU listing names spark plug connectors, and the AGS listing names plugs and ignition modules.

Does dielectric grease stop corrosion?

The listings state protection against corrosion. The Loctite listing states the grease protects electrical connections from salt, dirt and corrosion. The AGS listing states it shields against corrosion and water damage, and the FOTU listing states it resists corrosion with a formula that gives continuous protection in harsh weather.

What is the shelf life of dielectric grease?

Only the FOTU listing states a shelf life, at 5 years. No other listing here states a shelf life.

Related: best dielectric grease for battery terminals, battery terminal protector vs dielectric grease, best spark plug socket set for beginners, best digital multimeter for garage and the diagnostics and electrical hub. Also see best electrical contact cleaner for car battery.