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Product DescriptionSurefire Seed Oil is a tank additive that helps herbicide stick to weeds or grasses and penetrate them aggressively. The addition of a surface-active agent or crop oil concentrate, such as Surefire Seed Oil, is mandatory for Slay herbicide to work. Without the addition of a crop oil concentrate or surfactant, you could lose up to 90% of the effectiveness of Slay on broadleaf weeds. Add Surefire Seed Oil to Slay spray solution at a rate of ½ pint of Surefire per acre.