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Use promotional code MMJ25 at checkout to receive 25% off the following categories: Select Brake Parts, Select Hi-Performance and Truck Accessories, Batteries, Paint, Splash Guards, Select Ventvisors & Bug Shields, Springs & Spacers, Water Pumps, Belts, A/C Parts, Starters, Alternators, Fuel Pumps, Radiators, Radiator Fans, Thermostats, Caps & Clamps, Clutches, Spark Plugs, Plug Wires, CV Axles, Battery Chargers & Booster Cables, OE Locks, Rack & Pinons, Window Motors, RainX Wipers, Appearance Chemicals, Floor Mats, Lift Equipment, Hand Tools, Travel Accessories, Car Covers, Seat Covers, Wheel Covers, Body Repair, Collectibles and Apparel.

Use promotional code MMJ20 at checkout to receive 20% off the following categories: Ignition, Shocks & Struts, Chassis, Jumpstarts, Air Filters, Oil Filters, Bearings & Seals, Engine Parts, Wash Accessories,. Outdoor Lifestyle, Towing, Mini Air Compressors and Tire Repair Accessories.

Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes the following brands: Champion, Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner, Philips and BBK Performance. Valid online until 11:59 PM EST on 10/29/17.

Receive 25% Off Wagner branded brake parts with your online purchase. Use promotional code: WAGNER25.

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WD-40 Specialist Rust Release Penetrant Spray 490759
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  • Part #: 300004|
  • SKU: 490759

Available today

Pay in Store Available

    • Frees rusted/stuck parts
    • Penetrates rust

WD-40 Specialist Rust Release Penetrant Spray

A unique blend of solvents, metal working fluids and surfactants that provide fast-acting penetration. No other penetrant has our combination. Penetrates into tight crevices, threads and seams to break bonds that hold stuck parts together. Helps prevent rust and corrosion from reforming, and leaves behind a lubricating layer.
  • Frees rusted/stuck parts
  • Penetrates rust
  • 50% faster penetration than the leading competitor
  • VOC compliant in all 50 states
  • Safe to use on plastics, metal and rubber
  • Prevents rust and corrosion from reforming


WD-40 Specialist Rust Release Penetrant Spray is rated 4.8 out of 5 by 125.
Rated 5 out of 5 by from Great Stuff! This stuff works. The wait time is about 1/2 a beer but this stuff works!
Date published: 2013-08-14
Rated 5 out of 5 by from Broke the Rust Down Quick! I have tried this on a few projects around the house. I first used it on the kid's bike left outside, and this new WD-40 loosed up the rusted chain in no time. Seeing the smile on my kids face made him think it was a new bike again!
Date published: 2013-08-14
Rated 5 out of 5 by from love the nozle This works great and I will buy it from now on !
Date published: 2013-08-14
Rated 5 out of 5 by from Product is awesome Got a sample a couple weeks and having been using it, being in the maintenance field it it important to find products that work as advertised. This product works great, too bad we didn't get more as a sample.
Date published: 2013-08-14
Rated 5 out of 5 by from rust eater Shortly after I got this product I had disassemble a trailer that had been built 13 years ago.I live in minnesota and everything gets rusted terrible cause they salt the roads other than plow.I sprayed the bolts on the trailer with Specialist before trying to remove and it worked great
Date published: 2013-08-14
Rated 5 out of 5 by from Rust Penetrating Great for use on the farm.
Date published: 2013-08-14
Rated 5 out of 5 by from Another Great WD-40 product Used to loosen bolts of failed components to tear apart for failure review. Worked Great.
Date published: 2013-08-14
Rated 4 out of 5 by from worthy Was able to get the job done with little waiting. 
Date published: 2013-08-14
Rated 5 out of 5 by from It just works! It's nice when a product delivers what is expected and this one does it well. I tried it on a couple of rusted bolts that wouldn't otherwise move and presto, out they came.
Date published: 2013-08-14
Rated 5 out of 5 by from trusted tried it once...I'm hooked
Date published: 2013-08-14
Rated 1 out of 5 by from Not a good product! Trtied this and it did NOT do the job. Liquid Wrench WORKED!!
Date published: 2013-08-11
Rated 5 out of 5 by from Simply outstanding I tried this product and it is simply outstanding. Performance is great. I have never experienced this kind of performance from other penetrants!!!
Date published: 2013-08-01
Rated 4 out of 5 by from WE 40 Specialist I used this on heavy equipment assembly that I tried to repair. It was easy to dismantle and also it did not rust when I was away for 2 days when all the parts were open.
Date published: 2013-08-01
Rated 5 out of 5 by from great results i tryed this for the frist time and it works great
Date published: 2013-07-31
Rated 5 out of 5 by from Very Efficient I had some trouble with a few rusted nuts and bolts on an old trailer. I used the specialist grade rust penetrant and within no time I was able to break them free.
Date published: 2013-07-30
Rated 5 out of 5 by from Incredible results after years of being seized. Used this under recommendation by wholesaler here in New Zealand. Unfroze an old mechanism and interlock on a sensitive but obsolete piece of electrical equipment under restoration. Just incredible to see a 1935 vintage piece of generator history run free and work like it used to . Incredible work WD40 . Impressed 
Date published: 2013-07-21
Rated 5 out of 5 by from Sr. Design Engineer I have used WD40 for years. Have cans all over my house and shop. It is my go-to lubricant, penetrant, and protectant. It may not be the best at everything, but it does a good job on all thus a good "one does it all" product.
Date published: 2013-07-18
Date published: 2013-07-16
Rated 5 out of 5 by from The best to use to remove rusted bolts and nuts I bought this new WD-40 product. It works great. Had rusted brake bleeders. I thought I would end up buying new calipers. But with WD-40 Specialist the bleeders came out saving me money. I thank You WD-40.
Date published: 2013-06-09
Rated 5 out of 5 by from Good by tape and rubber bands This has been a long time coming, the attached extension. The tape that wont stick, the rubber bands that break, the "well, I will put it here." Then of course, you forget where you put it. I came up with my own method to attach the extension. I used a short piece of heat sensitive shrink tubing, and it worked like a charm.
Date published: 2013-05-29
Rated 5 out of 5 by from THE BEST RUST PENETRANT, HANDS DOWN! UNBELIEVABLE! I've been using Rust Release for a month or two, and its by far the best yet. I live in Ohio and work on a lot of rusty cars. And in 20 years of fixing cars, I have never had so many rusted stuck bolts, nuts, and what have come loose after using the Rust Release. I have been surprised 5 or 6 times the things this stuff gets loose!!! The regular WD-40 was very good, but this stuff blows everything else away. This is all you need!!!!
Date published: 2013-05-05
Rated 5 out of 5 by from Bettter than PB Blaster I've been using PB Blaster rust penetrant for a long time, but no more, wd-40 rust penetrant works faster and leaves less oily residue, plus it's got the smart straw built in. Because it dries faster than PB Blaster, it doesn't work as well for soaking, but wd-40 has another product for that
Date published: 2013-05-05
Rated 5 out of 5 by from Another fine WD-40 Product This stuff works. We use it at the shop on stubborn fasteners that have rusted together. Saves time and money.
Date published: 2013-04-25
Rated 5 out of 5 by from I'm sold I used it on a bushing sleeve that was "welded" onto a bolt with rust after torching and beating on it with a hammer for an hour i bought the product within 5 minutes of applying it slid off no problem
Date published: 2013-04-07
Rated 5 out of 5 by from This really does work I have used it on old locks,and yard tools,and the list goes on
Date published: 2013-03-10
Rated 5 out of 5 by from Awesome I use this on my SUV and Motor cycle along with other things that need a great protection from rust and water
Date published: 2013-02-28
Rated 4 out of 5 by from this thing works man, i love it
Date published: 2012-10-11
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