Roundup 5002530 Poison Ivy Plus Tough Brush Killer Ready-to-Use Pump 'N Go Sprayer, 1.33-Gallon Exclusive formula combines two brush-killing ingredients Specially formulated to penetrate the waxy leaves of hard-to-kill weeds and brush Visible results in 24 hours Kills weeds to the root. Guaranteed! Consumer Guarantee: If for any reason you are not satisfied after using this product, simply send us original proof of purchase and we will replace the product or refund the purchase price Rainproof in 30 minutes Kills all types of tough weeds and brush including poison ivy, poison oak, kudzu, wild blackberries and other invasive weeds