atp automotive AT-205 Re-Seal Stop-Leak Conditioner, 8 oz Bottles (2-Pack) — Restores & Softens Rubber Seals

ATP Automotive AT-205 Re-Seal is a concentrated seal restorer that rejuvenates dried rubber gaskets and stops common oil leaks without damaging bearings or internal components.

Designed for use in engines, transmissions, power steering systems, differentials and hydraulics, this two-pack of 8-ounce bottles offers a professional-strength formula that softens and conditions aging seals. Unlike crude oil-based stop-leaks, AT-205's chemistry avoids petroleum distillates so it refreshes elastomers without over-swelling, preserving seal integrity while reducing seepage and drips.

How quickly will AT-205 stop my vehicle's leaks?

Many users see reduced leakage within a few drives as seals absorb the conditioner and regain flexibility. Results depend on leak severity and how long seals have been degraded; hairline seepage responds faster than heavy gasket failure.

• Typical improvement visible after several miles of normal driving
• Best for seepage and slow leaks from rubber seals and gaskets
• Not a permanent repair for mechanically damaged housings or torn seals

Will AT-205 harm my engine, transmission, or steering components?

No—AT-205 is formulated to be safe with internal components and common fluids. It is compatible with conventional and synthetic motor oil, automatic transmission fluid (ATF), gear oil, power steering fluids and hydraulic oils, so it can be added directly without flushing or replacement.

• Contains no petroleum distillates that attack elastomers
• Won’t degrade bearings, seals or internal components when used as directed
• Safe for use across multiple systems and fluid types

How much do I need and how do I apply it?

Each 8-ounce bottle treats approximately a six-quart fluid capacity; adjust proportionally for larger systems. Application is simple—add to the affected fluid reservoir, run the vehicle to circulate, and monitor leak reduction over time.

• One 8oz bottle treats ~6 quarts; double for larger capacities
• Add directly to oil, ATF, steering, differential or hydraulic reservoirs
• Allow normal operation to circulate product through seals

What types of leaks is AT-205 best suited for?

AT-205 excels at restoring rubber components that have hardened, shrunk or become porous from age and heat exposure. It’s ideal for slow drips and weeping seals rather than catastrophic failures or physical tears in the sealing surface.

• Effective on valve cover, oil pan, rear main, and transmission seals
• Works on power steering and hydraulic system rubber seals
• Not intended to replace mechanical gasket replacement for major failures

Who is this for: ATP Automotive AT-205 Re-Seal is aimed at car owners, DIY mechanics and professional technicians who want a reliable, non-invasive method to reduce or stop slow leaks from rubber seals. It’s a practical first step for diagnosing seal-related leaks and an affordable maintenance product for older vehicles or equipment where replacing seals immediately is impractical. Keep in mind that severe or torn seals require mechanical repair; AT-205 is a restorative and preventive treatment rather than a permanent structural fix.

Features at a glance:

• Professional strength, fast acting resealer
• Rejuvenates rubber seals and gaskets across multiple vehicle systems
• Compatible with conventional and synthetic oils and common fluid types
• Free of petroleum distillates—won’t over-swell or break down seals
• 8oz bottle treats ~6 quarts (adjust as needed); two bottles included