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ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

4.5 out of 5 stars 16,117 ratings

Price: $22.10 Get Fast, Free Shipping with Amazon Prime

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Brand ATP Automotive
Color One Color
Style Compact
Item Weight 50 Grams
Item Dimensions LxWxH 7 x 4.5 x 4 inches

About this item

    This fits your .
  • Make sure this fits by entering your model number.
  • Professional strength fast acting resealer, stops leaks fast
  • Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
  • Compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
  • Does not contain petroleum distillates, will not over-swell or breakdown seals
  • 8oz bottle will treat a 6 quart capacity, adjust accordingly
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Always the perfect gift

Frequently bought together

  • ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle
  • +
  • Plexus Plastic Cleaner, Protectant and Polish (13-Ounce)
  • +
  • Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray
Total price:
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From the manufacturer

Product Description

AT-205 Re-Seal is a fast, effective and safe stop-leak for all rubber seals and gaskets. The exclusive formulation restores worn or dried out seals and is not harmful to internal bearings and components. 

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ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle


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What's in the box

  • 1 Bottle
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    Liquid Volume 8 16.9 fluid_ounces 325 milliliters 8 11 fluid_ounces 12 fluid_ounces

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    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    16,117 global ratings

    Top reviews from the United States

    Reviewed in the United States 🇺🇸 on May 22, 2019
    Customer image
    4.0 out of 5 stars more potent than advertised
    By Stephen Throop on May 21, 2019
    Scotty Kilmer said AT-205 is watery and harmless because it’s a polymer. I’d never heard of a watery polymer. ATP calls it a plasticizer. A plasticizer is a solvent used to make a polymer more rubbery by loosening the bonds between molecules. This one seems to be diethylene glycol monoethyl ether.

    ATP says it won’t harm internal components. The website says it’s compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids, and hydraulic oil. It has a 3-minute video, which for 5 seconds presents a chart of recommended amounts with three columns of seven figures each. Do they really expect you to digest that in 5 seconds?

    For those 5 seconds there are two lines of print below the chart. If you pause the video, they are grayed out and covered with ads. I had to replay that segment several times to be sure I understood. They say, “Recommended use is approximate due to blending properties with oil. No risk if slightly over treated.”

    Contrary to their assurances, this implies a risk. It seems as if ATP did not intend for the viewer to see the warning.

    The video devoted a minute to showing the representative open a hood, pour in a bottle of AT-205, and close the hood. An Amazon customer reported that after he did so, the concentrated solvent in the oil pan caused the paint to come loose and clog the screen on his oil pump. It’s not a new product, but the video didn’t recommend running the engine to mix the solvent. Buyer beware!

    My 35-year-old car occasionally smoked on startup. Probably the valve seals were worn or shrunken. Deposits from oil additives damaged spark plugs and O2 sensors. AT-205 would be a lot cheaper than having the seals replaced, but I was afraid AT-205 could expand seals more than necessary, and that could accelerate wear.

    For 4 quarts, ATP recommends 6oz, or 180ml. The oil would have about 4.7% solvent. I decided to try 100ml (about 2.7%) and add the rest if necessary. I used a polypropylene measuring cylinder. It measures precisely, pours as neatly as using a funnel, and rinses better than glass. I ran a short errand to mix it and ran another short errand the next day. Then I cleaned the grime below the valve cover gasket, which leaked.

    Months have passed. The gasket has not leaked, and I haven’t seen or smelled any oil smoke.

    My riding mower was 25 years old. An unseen oil leak caused chaff to accumulate on the cooling fins, hidden under the housing. That interfered with the flow of cooling air. It often smoked on startup. I didn't know if leaky rubber seals caused either problem.

    I added 25ml of AT-205, about 1% of the oil in the crankcase. I mowed a few minutes to mix it. The next day, I cleaned off the oil and grime. in the months since then, the engine has stayed clean, and it hasn't smoked on startup.

    The next time I have a leaky machine, I’ll start with 0.5% to minimize risk. I can always add more.

    Update: Scotty was right about using AT-205 to preserve plastic parts. My positive battery terminal protector uses a "living plastic" hinge. It had stiffened so that it wouldn't stay down. A couple of applications of AT-205 improved it. My big concern was the duct from the MAF meter to the throttle. It had become brittle over the years. It looked impossible to fabricate a new one with all those hose fittings. I've applied AT-205 three times. A little goes a long way. I put a teaspoon or so in a cup and apply it with a cotton ball. I also wipe it on pneumatic hoses. Plastic absorbs it slowly, so I check after a couple of days. Skin absorbs it readily, but research has shown it's harmless (pharmacologically inert).

    Another update: The manufacturer of my mower engine recommends oil changes according to engine hours and doesn't mention time intervals. I waited two years. During that time, the oil continued to feel and smell okay.

    Two weeks after the oil change, I got a lot of oil smoke on startup. I had assumed that the solvent not immediately absorbed by the rubber had evaporated from the old oil long ago. Apparently it had stayed in the oil, continually refreshing the old seals. Because I'd used it conservatively, I had some on hand to supplement the new oil.
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    Top reviews from other countries

    JAZZY DHAMI
    5.0 out of 5 stars Seal it before it’s too late.
    Reviewed in the United Kingdom 🇬🇧 on March 1, 2021
    3 people found this helpful
    Report abuse
    George
    5.0 out of 5 stars Oil Leak Fixed - 100%
    Reviewed in the United Kingdom 🇬🇧 on April 6, 2017
    11 people found this helpful
    Report abuse
    Amazon Customerpaul
    1.0 out of 5 stars rubbish never worked
    Reviewed in the United Kingdom 🇬🇧 on April 28, 2022
    Laurence Rogers
    1.0 out of 5 stars Disaster.
    Reviewed in the United Kingdom 🇬🇧 on August 29, 2020
    Gary
    1.0 out of 5 stars Destroyed transmission seals
    Reviewed in Canada 🇨🇦 on September 25, 2018
    21 people found this helpful
    Report abuse