One of the mysteries of the English language finally explained.
(of a chemical spray or other substance) not able to be washed away by rain.
- ‘This spray is longer lasting than the copper sprays used on tomatoes, and it is rainfast.’
- ‘Allow at least six hours for the glyphosate products to become rainfast.’
- ‘This product is cheaper, has a better safety profile, controls both types of rhizomes and is rainfast after 2 hours.’
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