How to Fix a Leak in a Spa Sealer

Identify the leak in your spa. If the leak is in the shell or in a line, then you're going to treat it differently than if the leak is around a gasket that's gone bad. If necessary, use food coloring or dye in the water to see what direction it's pulled so you can identify the leak.

Use a leak sealant on lines. Products such as Fix A Leak require you to turn off the filter and set the spa on a low pump as the water is recirculated. These products are heavier than water and they will sink to where the water is leaking from. Once the leak sealant has been allowed to circulate and find the leak (4 to 6 hours usually, depending on the product), turn off the spa and allow 24 to 48 hours for the sealant to cure. After that, put the filter back in and return to normal pressure and use.

Apply a leak sealant to the tub section. Drain the water and be sure that the crack is completely dry and free of dirt. Apply the crack sealant according to the instruction (products vary, and whereas some are applied with a trowel, others are put on with a caulk gun). Allow the proper amount of time to dry, and then fill the spa to test the sealant.

Replace gaskets. Rubber gaskets, such as those in the pump where the lines connect or where the water lines connect to the spa, will wear out over time. Drain the water and open the line so that you can get at the gasket(s) in question. Take the gasket out, prying with a screwdriver if necessary, and replace it with a new gasket. Once the gasket is replaced, close the line or reassemble the pump connection and turn the spa on again to see if the leak has stopped.