Lee Richards
Hi Ash I expect that the leak is on a joint between sections of gutter if the gutter itself is not split. The repair will depend on the material your guttering is made from. Cast iron guttering rely on a jointing putty and a nut and bolt fixing to make the joint, if this is the case you should be able to re-make the original joint. If the gutter material is plastic then the best way to solve the problem would be to remove it and take it to a good builders merchant to match it. You can purchase roof and gutter sealant for use in a cartridge gun. Myself I would only consider this a temporary measure. Hope this has been helpful Kind Regards Lee Richards MCIPHE RP Water Trade Ltd