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Ships within 48 hours · Estimated delivery Jul 23 - Jul 28
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Description
certainty herbicide rainfast Rainfast® Surfactant/Wetting AgentThe 100% active ingredient, a non ionic surfactant to enhance ag chemical performance through rain fastness, leaf wetting, and stomatal flooding We cannot ship this product into: AR CA DE ID MS PRODUCT INFORMATION Produces rain fastness, leaf wetting, and stomatal flooding Maximizes performance of pesticide and foliar fertilizer applications. Keeps your solutions on target plants and produces stomatal flooding. Does an unbeatable job in water based
The 100%-active ingredient, a non-ionic surfactant to enhance ag chemical performance through rain-fastness, leaf wetting, and stomatal flooding
We cannot ship this product into: AR CA DE ID MS
PRODUCT INFORMATION
Produces rain-fastness, leaf wetting, and stomatal floodingMaximizes performance of pesticide and foliar fertilizer applications. Keeps your solutions on target plants and produces stomatal flooding. Does an unbeatable job in water-based sprays and with fungicide applications. Six to 12 ounces treats 100 gallons of spray solution; 1 gallon treats 1,100 to 2,100 gallons of spray solution.
- Improves pesticide efficiency
- Produces superior leaf wetting, spreading, and penetration
PRODUCT FEATURES
What are the usage rates for Rainfast?Usage rates are:
- 6-12 ounces per 100 gallons of solution
- 1 ounce per 100 gallons in foliar fertilizers.
Depending upon pesticide labels, apply 6-12 ounces per 100 gallons of water.
Follow pesticide labels carefully for specific use recommendations with post-emergence herbicides.
What is Rainfast?
Rainfast is a highly effective nonionic surfactant/wetter/spreader penetrant, based on chemistry that provides superior leaf wetting, spreading and penetration of spray solutions.
You can maximize the performance of pesticide or foliar fertilizer sprays by keeping the solution on target plants. Rainfast produces rain-fastness quickly. Follow the chemical label for usage rates.
File Downloads
Rainfast Safety Data Sheet (Size: 168.8 KB)
Rainfast Sell Sheet (Size: 189.1 KB)
Rainfast Spec Sheet (Size: 83.3 KB)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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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]
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4.5 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 4
Works as intended but lowers airflow
Style: HEPA
I got this because of the wildfire smoke in my area. It definitely filters out smell compared to a regular filter so I'm assuming it's also filtering out larger particles in the air.
However, I've noticed that the airflow is reduced by a lot and the car is a lot warmer on the same setting I've used for years.
It's a trade off and I might just rotate filters depending on AQI and how hot it is since it takes like a minute to change it out.
I would recommend it if you live in an area that's smoky or cooler but not in places that get hot.
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Reviewed in the United States on July 13, 2023
★★★★★ 5
Fits and filters great
Style: PUREFLOW
Perfect fit and replacement for my wife's car air filter. The air seems to be a little fresher after putting this one in i believe it makes a difference to spend a little more on a quality filter.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2026
★★★★★ 5
Fits 2018 Honda Cr-V LX
Style: Particulate Media
Fits 2018 Honda Cr-V LX FWD. Be sure to install this filter with the arrow pointing down. Note that the plastic cover that holds the filter in place has an arrow pointing up to show you which direction to orient the plastic cover, not the filter, which again, should have the arrow pointing down.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Fit 2026 Honda Passport
Style: HEPA
This fit a 2026 Honda passport elite. Amazon’s recommendation did not fit.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Good
Style: HEPA
Good
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Reviewed in the United States on May 18, 2026