If you're dealing with dried-out, squeaky suspension rubber components, ATP AT205 may offer a simple solution. This rubber protectant and seal conditioner is popular for use on various rubber parts, but how well does it work on suspension components like bushings, bump stops, and control arm mounts? This guide covers everything you need to know about using ATP AT205 on suspension rubber—how it works, where to apply it, and what results to expect.
What Is ATP AT205?
ATP AT205 is a liquid rubber conditioner designed to penetrate and restore dried, hardened rubber. Unlike simple silicone sprays that sit on top, ATP AT205 absorbs into the rubber compound, helping to replenish lost oils. It's commonly used on weatherstripping, belts, hoses, and rubber seals. The product claims to reduce shrinkage, soften stiff rubber, and prevent future cracking.
Can ATP AT205 Be Used on Suspension Rubber Parts?
Yes, you can use ATP AT205 on many suspension rubber components, but it's not a cure-all. It works best for rubber that has not yet cracked or crumbled. Suspension rubber parts are constantly under stress—compression, torsion, and vibration—so the product can help maintain flexibility and extend life. However, if rubber is already torn or severely worn, ATP AT205 won't repair it.
Types of Suspension Rubber Parts Suitable for ATP AT205
- Control arm bushings: These pivot joints often develop squeaks when rubber hardens. ATP AT205 can soften the outer rubber layer, reducing noise temporarily.
- Stabilizer bar bushings: Small rubber bushings that connect the sway bar to the frame. Applying ATP AT205 can quiet squeaks and prevent premature wear.
- Strut rod bump stops: Bump stops at the top of struts absorb impacts. Softening them with ATP AT205 can improve ride comfort.
- Ball joint covers: Some ball joints have rubber boots that can stiffen. Conditioning the boots helps keep dirt out.
- Leaf spring bushings: Eye bushings on leaf springs often dry out and squeak. ATP AT205 can penetrate these components effectively.
Benefits of Using ATP AT205 on Suspension Components
Restores Flexibility
As rubber ages, its natural plasticizers evaporate, leaving it hard and brittle. ATP AT205 soaks into the surface, restoring some flexibility. This is especially helpful on suspension parts that have started to stiffen but haven't failed yet. A more flexible bushing can better absorb road vibrations and reduce harshness.
Reduces Squeaks and Noise
Hardened rubber rubbing against metal creates squeaks and creaks. Applying ATP AT205 to bushings and bump stops lubricates the rubber-metal interface, often eliminating noise for weeks or months. For many drivers, this is the main reason to use the product.
Prevents Drying and Cracking
Regular application of a rubber conditioner like ATP AT205 can slow the drying process. By keeping the rubber pliable, you reduce the chance of cracks forming under load. This can extend the service life of suspension rubber parts, saving you money on replacements.
How to Apply ATP AT205 to Suspension Rubber
- Clean the rubber surface: Use a degreaser or brake cleaner to remove dirt, grease, and old silicone sprays. Allow to dry completely.
- Apply ATP AT205: Use the supplied nozzle or spray bottle. Apply generously to the rubber part. For bushings, try to get the liquid between the rubber and the metal sleeve if possible.
- Let it penetrate: Wait 10–15 minutes. The rubber will darken as it absorbs the liquid. Reapply if the surface still looks dry.
- Wipe off excess: Use a clean cloth to remove any leftover liquid on the outside so it doesn't attract dust.
- Drive and reapply: After a short drive (warm rubber absorbs better), you can apply a second coat. Repeat every 3–6 months for best results.
Pro tip: For control arm bushings, jack up the vehicle to relieve weight on the suspension, allowing better access and deeper penetration.
Potential Limitations
ATP AT205 is not a permanent fix. It's a conditioner, not a structural repair compound. Here's what to watch for:
- Severely worn parts: If bushings are cracked, missing chunks, or have excessive play, ATP AT205 won't restore them. Replacement is the only option.
- Temporary effect: The softness lasts from a few weeks to a few months, depending on weather and driving conditions. Regular reapplication is needed.
- Not a lubricant: While it reduces squeaks, it's not designed as a heavy-duty lubricant for high-motion parts. For ball joints or tie rod ends, use a proper grease.
- Compatibility with other rubber: Some modern suspension rubber is urethane-based or synthetic. Test on a small area first to ensure no adverse reaction.
Final Recommendation
ATP AT205 is a cost-effective maintenance product for suspension rubber that is still structurally sound but showing signs of hardening. It works well on stabilizer bar bushings, control arm bushings, and bump stops to quiet noises and prolong life. For best results, clean the parts thoroughly and apply regularly. However, if your suspension rubber is already cracked or has significant play, replace it outright. ATP AT205 is a stopgap, not a replacement for worn components. Use it as part of your routine suspension maintenance, and you'll likely extend the life of your rubber parts by a year or more.