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

4.5 4.5 out of 5 stars 18,710 ratings

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1 Count (Pack of 1)

Purchase options and add-ons

Brand ATP Automotive
Style Compact
Item Weight 50 Grams
Item Dimensions LxWxH 7 x 4.5 x 4 inches
Compatible Material Rubber

About this item

  • 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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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 7 x 4.5 x 4 inches; 1.76 ounces
  • Item model number ‏ : ‎ AT-205
  • Date First Available ‏ : ‎ July 7, 2004
  • Manufacturer ‏ : ‎ ATP
  • ASIN ‏ : ‎ B000NVW1LM
  • Customer Reviews:
    4.5 4.5 out of 5 stars 18,710 ratings

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. 


From the manufacturer

AT-205 Re-Seal - How it works

AT-205 added to leaking system

AT-205 Re-Seal is added to any leaking engine, transmission, power steering system, differential or hydraulic system (except for brakes) to condition rubber seals/gaskets and stop leaks. Simply pour it in as you would be filling it with oil or fluid.

The formulation blends with the oil

The additive blends with oil in the system and is circulated throughout during operation, treating and conditioning rubber seals and gaskets.

Conditions and rejuvenates seals

AT-205 is a plasticizer, a type of chemical used in rubber manufacturing to set hardness and flexibility. As a seal or gasket gets older it can dry out, harden and wear - treating it with AT-205 will rejuvenate it, restoring it's flexibility and sealing properties.

Most leaks resealed within 5 hours

As long as the seal or gasket is not severely damaged or torn, the leak is resealed after a total of 5 hours of driving - saving time and money from costly repairs.

What's in the box

  • 1 Bottle
  • Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    18,710 global ratings

    Customers say

    Customers like the performance and quality of the sealant. For example, they mention it works great, it softens rubber very effectively, and it helps prevent rubber from crumbling. That said, opinions are mixed on seal quality, leakage, and oil consumption.

    AI-generated from the text of customer reviews

    1,426 customers mention1,047 positive379 negative

    Customers like the performance of the sealant. They say it works great, has no issues, and is amazing. Some say that the product works great for dried out and cracked seals or gaskets, and that it's worth it.

    "...far the longest review I have ever done, but I feel that this product is worth it. Try it and it will WORK for you too." Read more

    "...Changed the oil then added this, quit leaking within hours. Great stuff!" Read more

    "...A few weeks later I started getting a misfire on cylinder 1, I suspect it's a bad lifter - making a nasty metal on metal ticking noise...." Read more

    "...This works great for dried out and cracked seals or gaskets, but if it’s completely torn it will rip it open more. 2, be careful buying off amazon...." Read more

    209 customers mention162 positive47 negative

    Customers like the quality of the sealant. They say it revitalizes rubber, softens it very effectively, and helps prevent it from crumbling. They also say the seals retain their elasticity and tensile strength. Customers also say it helps keep the hoses and boots from cracking.

    "...Sprays all rubber boots, bushings and seals to renew them. Could see a visible renewing, they now look hydrated and good as new...." Read more

    "...He said this is great for spaying on rubber components of vehicles to extend the life of them. Recommend using this product!" Read more

    "...Came back out an hour later. Bone dry. Not one spot. I don’t know what it is but it works!!!!" Read more

    "...The whole mess is covered in years of crud. Jeeps have crappy power steering pumps compared to gm...." Read more

    1,686 customers mention893 positive793 negative

    Customers are mixed about the leakage. Some mention that it completely stopped a leak from the steering rack area, while others say that it looks to still be leaking. Some customers also mention that the sealant fixes a leaking transmission cooler line.

    "...Using AT-205 has completely stopped the leak! Very satisfied with this product" Read more

    "...It was leaking hydraulic fluid from one of the directional cylinders, did not have damage so I thought I would try the AT-205. Guess what?..." Read more

    "...Changed the oil then added this, quit leaking within hours. Great stuff!" Read more

    "...Still, the leak has not been completely gone, so I try the second bottle recently and will see if it really does the job but it looks promising thus..." Read more

    213 customers mention124 positive89 negative

    Customers are mixed about the seal quality. Some mention it helps to restore seals and rehydrates them, thereby reducing oil leaks. However, others say that the seal was still hard and brittle, and that it only works for rubber seal leaks and very tiny leaks, since the rubber seals don't appear to swell.

    "...This stuff literally insures your vehicle head gasket! I have full confidence in this product!" Read more

    "...change and most of a bottle of At-205 for about 5 miles, the motor started knocking and the oil light came on. Had to have it towed back...." Read more

    "Helps to restore seals therby reducing oil leaks." Read more

    "...seems that it would only seal very tiny leaks, since the rubber seals dont appear to swell (within human perception)...." Read more

    171 customers mention104 positive67 negative

    Customers are mixed about the oil consumption of the sealant. Some mention that there was not ONE drop of oil anywhere, while others say that the oil pan and transmission were covered with oil.

    "...It’s been 3 months now and no more oil spots on my driveway. Very happy with this product. Thank you Scotty Kilmer!!!..." Read more

    "...’s or constantly top off the fluid was a pain because the fluid needs purged of air after every top off...." Read more

    "...Now already ten months passed and the oil level on the dip stick is good. No more leaks.This is really an amazing product...." Read more

    "...to work the next day, and back home ( about 40 miles )...no dripping oil anymore. This stuff actually works !!!!..." Read more

    more potent than advertised
    4 Stars
    more potent than advertised
    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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    Ron
    5.0 out of 5 stars Great stuff
    Reviewed in Canada on February 17, 2024
    Size: 1 Count (Pack of 1)Verified Purchase
    Emilio Heredia
    5.0 out of 5 stars Me ahorró la reparación en el taller mecánico
    Reviewed in Mexico on June 28, 2023
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    Trev
    5.0 out of 5 stars This really works.
    Reviewed in the United Kingdom on March 1, 2024
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    vikash kumar bhagat
    5.0 out of 5 stars Excellent product
    Reviewed in India on March 29, 2022
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    2 people found this helpful
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    Charles T.
    5.0 out of 5 stars Received this item in very good condition.
    Reviewed in Singapore on February 22, 2023
    Size: 1 Count (Pack of 1)Verified Purchase