SKU: 21035822634

Roundup® Dual Action Weed & Grass Killer Plus 4 Month Preventer Concentrate

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Description

Roundup® Dual Action Weed & Grass Killer Plus 4 Month Preventer ConcentrateRoundup Dual Action Weed & Grass Killer Plus 4 Month Preventer Concentrate kills existing weeds and grass down to the root and prevents new weeds from growing for up to 4 months This weed killer and preventer is rainproof in as fast as 30 minutes, and produces visible results in as fast as 6 hours Apply this herbicide to hardscapes and landscapes cracks and crevices in driveways, sidewalks, and patios, along fences, in mulched beds or around the base

  • Roundup® Dual Action Weed & Grass Killer Plus 4 Month Preventer Concentrate kills existing weeds and grass down to the root and prevents new weeds from growing for up to 4 months
  • This weed killer and preventer is rainproof in as fast as 30 minutes, and produces visible results in as fast as 6 hours
  • Apply this herbicide to hardscapes and landscapes - cracks and crevices in driveways, sidewalks, and patios, along fences, in mulched beds or around the base of well-established desirable plants, shrubs, or trees, and on gravel areas
  • All ornamental bedding plants, trees, shrubs, sod, and seed can be planted 4 months after application
  • Add 6 fl. oz. of Roundup® Dual Action Concentrate per gallon, mix into tank sprayer, and spray weeds (to prevent new weeds and grasses from growing, you must spray the entire area you want to control, not just the emerged weeds)

Root out the toughest weeds and grasses with Roundup® Dual Action Weed & Grass Killer Plus 4 Month Preventer Concentrate. This formula kills existing weeds and grass down to the root, and prevents new weeds from growing for up to 4 months by creating an invisible barrier in the soil. Apply only where you want to kill existing weeds AND prevent future weed growth for up to 4 months, such as cracks and crevices in driveways, sidewalks, and patios, along fences, in mulched beds or around the base of well-established desirable plants, shrubs, or trees, and on gravel areas. In order to prevent new weeds and grasses from growing, you must spray the entire area you want to control, not just the emerged weeds. For best results, apply during warm, sunny weather above 60°F. Rain or watering 30 minutes after application will NOT wash away effectiveness. After application, weeds will begin to yellow and wilt within hours with complete kill in 1 to 2 weeks. All ornamental bedding plants (annuals and perennials), trees, shrubs, sod and seed can be planted 4 months after application. Roundup® Dual Action Concentrate covers up to 1,600 sq. ft.

Step by Step Instructions

When and Where to Use

Where Not to Use

Do NOT Spray...

  • Plants or grasses you like – they will die.
  • Landscaped areas around young plants or in areas that will be planted or seeded within 4 months.
  • In lawns or for lawn renovation as this product prevents desirable grasses from growing too.
  • For vegetable garden preparation or in and around fruits and vegetables.
  • Next to a fence if desirable plants and grasses are growing on the other side.

Where to Use

Apply only where you want to kill existing weeds AND prevent future weed growth for up to 4 months, such as:

  • On cracks and crevices in driveways, sidewalks, walkways and patios
  • Along fences, foundations, retaining walls, and curbs
  • In mulched beds or around the base of well-established (at least 6 months old) desirable plants, shrubs or trees
  • Gravel areas
  • On parking areas and under decks

When to Apply

  • For best results, apply during warm, sunny weather above 60°F. Spray when air is calm to prevent drift to desirable plants.

How Often to Apply

  • Wait at least 2-3 months before spraying a previously treated area.

Special Instructions

Watering Tips

  • RAINPROOF: rain or watering 30 minutes after application will NOT wash away effectiveness.

Mixing Instructions

  • 1 Tablespoon (Tbs.) = 3 teaspoons (tsp.)
  • 1 fl. oz. = 2 Tbs.
  • 6 fl. oz. = 12 Tbs.
  • To measure the right amount of product, use the convenient easy-measure cap with volume markings inside.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 21035822634

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Product Reviews
F
Verified Purchase
Frances
Lowell, US
★★★★★ 5
It did work
Size: 1-Pack (32 oz)
Sealed a small nail hole in a front tractor tire. Better than taking to shop for inside patch or making the 3x bigger for a rope patch.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
J
Verified Purchase
Jim
Massapequa, US
★★★★★ 5
Fixed a Bead Sealing Issue
Size: 1-Gallon (128 oz)
For traction in snow, I recently installed new "agricultural" style lugged front tires on a Simplicity garden tractor from around 1980. The tractor looks like it's survived a war, evidently having had a hard life as a workhorse owned by a school district. The front rims are rusty, and I naively thought the beads of these thick tires would seal properly anyway. They didn't. The jug of sealant ships with a valve core removal tool. Removing and reinstalling the cores is a piece of cake if you've never done it. I pumped a generous amount of the product into each tire and then did a few fast laps in a grassy paddock. It's a Kohler 19HP twin and it's a bit of a rocket. 😎 One tire sealed, the other didn't, and there was still a faint hiss. I added more product to that side and repeated the process. It seemed to hold. The next day that side was flat again, so I added more sealant and this time it held. Based on this experience, I'd say that instead of strictly following what the instructions recommended as an amount per tire, keep adding product in increments until the tire holds air. It's good stuff and it works. Will the tire self-heal if I puncture it? I don't know yet. It saved me the headache of having to remount these small tires or install tubes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
S
Verified Purchase
shimshong
Los Angeles, US
★★★★★ 5
Stop wasting your money on green slime or Fix-A-Flat or any of the other tire sealant
Size: 1-Gallon (128 oz)
Flat out is by far the best product on the market to fix flat tires and prevent flat tires. This will be the second gallon jug that I purchased that stuff on everything. all of my landscape equipment has it in every tire. And to paint and even better picture for you I have a scag mower that is 20 years old The tires are probably 18 years old ugly as could be and would not hold air until I put the flat out in it it has been sitting now for over a year and every tire still has air That's how good the stuff is. Don't just buy one gallon by two cuz it will get used
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 11, 2025
A
Verified Purchase
Amazon Customer
Phoenix, US
★★★★★ 5
John Deere 5x4 (gator)
Size: 4-Pack (128 oz), Size: 4-Pack (128 oz)
Excellent product. The John Deere 5x4 (Gator) in picture sat for ten years, the tires were flat, the front tire was the worse. To move this Gator from my neighbors place he had to load it on a trailer, he aired up the rear 4 tires but the front would air up and leak before he could move it. He put a make do wheel to get it moved to my place. shortly after unloading the rear 4 tires went flat. All were badly weathered. I read about a stop leak "FLATOUT" I ordered one bottle and put it in the front wheel and I aired it up, it held air for several hours. I called FLATOUT Support and told them I put 1/2 bottle in front tire and how it helped, He said it calls for a full bottle per tire so I added the rest of the FLATOUT. I bought four more bottles of FLATOUT and put those in all 4 tires, put air in and drove the unit a block. next day two tires were low so I finished putting FLATOUT in and aired the tires and drove two to three blocks. the weather snowed so I parked the Gator for two weeks, the tires never went flat. I checked the air pressure and had lost about 2-3 pounds, refilled with air and on a warm day drove the Gator about 2 miles. No flat tires. Note the front tire had a weathered crack 4 inches long where it sat folded for so many years and I saw where this product had sealed this leak and no air loss after two weeks of sitting.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2021
R
Verified Purchase
R. Arminio
Alexandria, US
★★★★★ 5
Recommended
Works extremely well for tire patch repairs. Just be sure product is totally dry before applying patch on inner tube or interior of tubeless tire.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 25, 2026

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