I would not try it. Most of those "miracle in a can" sealers use either a chemical that swells seals or metallic flakes that plug the leak. The problem is that a water pump seal is not a lip type seal that will swell up, and because the seal rotates as the pump turns any type of mechanical plug will not work.
Another side effect of many of those sealers is because they are designed to plug small holes, they can clog the radiator or the heater core. If that happens you will have a much higher repair bill.
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Monday, May 29th, 2017 AT 6:13 PM