The 6 Best Plastic sealing compounds (2023 reviews)

The chemical guys plastic sealing compound is the best feature-rich compound on the market today. This product will not make your paint shine with a mirror finish. It is engineered for ultimate versatility. It cleans, seals and protects it without streaking or developing a film. It does a nice job of resisting water but where it really excels is giving the windows great clarity. This stuff makes it very shiny and the water beads off very easily. The gloss is deep and bright. This can even be used on your chrome and glass. The product is easy to apply and easy to buff off.

Why We Like This:

Works really well and very easy to apply
Easily applied and buffed out, even in cold weather
It applies easily but does take some effort to buff off
Many in neighborhood asked if it is a new car

Best For valve cover job: Permatex differential cover sealing

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Best part: permatex differential cover sealing costs comparatively low and it is available to ship in 24 hours. This is the perfect tool for oil leaks, especially in those BMW's. It's a liquid rubber that dries into an oil resistant gasket. It can be used in place of a cork gasket on a horizontal band saw. It is perfectly, and dispenses evenly. It is used to replace pre cut gaskets or be used as a gasket maker or gasket sealant.

This is a high temp silicone gasket sealant for stopping leaks or forming a makeshift seal in a pinch if you can't find a gasket. It comes with a non-corrosive formula designed for superior adhesion to oily surfaces and long term durability. It is great for making gaskets for cars and trucks.

Why We Like This:

Worked well for sealing delidded cpu
High quality, but long dry times
Easy to use and no oil leaks
Hours and tighten to the recommended torque specifications for your vehicle

Best With gasoline fuel tanks: 3M talc Plastic sealing compound

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Compared with other compound in this category, the 3m talc plastic sealing compound has a convenient design. This sealant is made especially to seal underwater. It cures to form a firm, rubbery, waterproof seal on joints and boat hardware, above and below the waterline. It works well as a thin-bodied sealant. It's very thin and runs easily. It has a long "open" time before setting up.

This material by 3m requires high humidity to set up. It is designed for auto applications that work very well. The best attribute is that it is flexible so it doesn’t crack or break after applying so it’s the perfect repair.

Why We Like This:

Great for sealing around transducer mount and screws that rout the transducer wires
High quality with great sealing and adhesion
Easy to use and the adhesion was great
Top quality adhesive for marine environments

Best For ding Repairs: Totalboat Plastic sealing compound

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The totalboat plastic sealing compound is capable of outshining several other compound featured in this list in overall features for the price point. This fairing compound is easy to mix and sand. It has minimal shrinkage, and can be sanded, primed, or painted. It will bond to pretty much whatever it touches. It is a versatile epoxy fairing compound and filler ideal for boat building and repairs above and below the waterline.

This stuff is strong, sandable, and flexible. It has a much slower set time so that shaping and leveling is not complicated. The hardened roll flexes a good amount and is difficult to break by hand. The compound goes on nicely using standard filler application tools.

Why We Like This:

Easy to mix, smooth to spread and plenty of working time
Easy to sand and drives very quickly
Easy to use, sands great, sticks well
Spreads well when warm, not so good when cold

Best For TPMS sensor Repair: Permatex Plastic sealing compound

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The permatex plastic sealing compound's material feels more premium than its price would suggest. This black silicone adhesive sealant is a sensor-safe, general purpose black rtv sealant that can be used inside or outside for all your jobs. It can be used on cooking utensils and handles and baking pans. It's a standard black silicone in a tube instead of a can. It is simple to open, dispense and apply. You can use it as weather stripping around your windows, or like a rubber stopper to keep a door from rattling.

It can use for sealant/gasket on autos.

Why We Like This:

Great stuff it you need a hole patched.seals tight and pretty fast
Sticks well and is a tight bond
Very effective at keeping out water and preventing short circuits

Best For High pressure Water pipes: JB Weld Plastic sealing compound

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The jb weld plastic sealing compound is suitable and reliable and fits well with your regular usage. This stuff works well if you get a crack in a rock fountain. It is designed for high pressure water pipes like swimming pool filters, etc. It is good as new, and this epoxy holds up to high heat and humidity. It is easy to get off the fingers. It is easy to knead, apply and let it dry for a day or two. It is great for small leaks at a joint under the house. The putty itself is extremely easy to use.

Why We Like This:

Cures fast, very clean and hard
Has a strong smell when mixing
Easy to use and work with

The 6 Best Plastic sealing compounds (2023 reviews)

Our Top Picks:

Best Overall: chemical guys Plastic sealing compound

Best For valve cover job: Permatex differential cover sealing

Best With gasoline fuel tanks: 3M talc Plastic sealing compound

Best For ding Repairs: Totalboat Plastic sealing compound

Best For TPMS sensor Repair: Permatex Plastic sealing compound

Best For High pressure Water pipes: JB Weld Plastic sealing compound

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