You can use JB Weld epoxy brand products to seal cracks or leaks in your toilet tank. This product will work on fiberglass, ceramics, plastics, and concrete, just to name a few common surfaces. To seal a crack in your toilet tank, make sure the cracked area is clean and dry. Apply the JB Weld epoxy and allow it to dry. If the toilet is leaking from inside the tank, chances are the fill valve located within the tank has a faulty washer. The replacement process is just as easy as changing the washer on a coupling nut. Many homeowners can repair their leaking toilet in as little as thirty minutes, offering a fast, effective, and easy solution. Toilet leaks are sneaky. Many toilet leaks are silent and can occur without you knowing, but fixing them is pretty simple. Step 1: Check for Leaks and Obstructions. The first thing to do is check the inside of the toilet tank for obvious problems. If the toilet is running constantly, it could be something as simple as an obstruction keeping the flapper from closing. If there's a float arm (a flotation device attached to a metal arm), hold it up while the tank fills Many times , tightening the bolts will solve this problem. (3) The Toilet Flange seal can leak at the floor. This requires pulling up the toilet and replacing the wax ring. (4) The water valve or supply tube can also leak. Tightening may fix it, replacing washers or replacing tubes and valves may be required. Leak at Shut Off Valve. If the leak is coming from the shutoff valve, here’s what to do next: close the main water supply to the leaking toilet shutoff valve, and then loosen the bonnet nut on it with an adjustable wrench. Use the wrench to tighten the nut again; be very careful to not damage the nut or over tighten it. A toilet tank sweating can be more than a nuisance; it could be causing damage. The flapper could be leaking. Replacing a flapper is a straightforward fix for a plumbing professional. Follow steps 1 and 2 above, then do the following: Remove the ball float using a plastic snap. Unscrew the nut or snap the rod out of the valve. Put the flush valve through the hole in the bottom of the tank. Hold the flush valve in place with a nylon nut. The nut should be snug, but be careful not to overtighten it. .

fixing a leaky toilet tank