Is your gutter leaking? Then it is not doing its job! There are two things you can do to fix this problem. First, if the leak is due to a hole in the gutter, then you can patch it. However, if the leak is coming through a joint, then the joint needs to be repaired.
Patching a hole
When patching a hole in a gutter, the first thing you want to do is clean off any dirt and/or rust on the gutter. These decrease the chances that the patch will hold. In order to clean the gutter, first use a wire brush and water, then let the area dry, and after scrub the area with an abrasive pad. Make sure all loose dirt and rust are off of the area.
After this, you are ready to patch! This is done with plastic roofing cement. The cement should be smoothed out over the patch, leaving no bumps or edges that will get in the way of water flow through the gutter. This type of patch will work for small holes, specifically those around the size of a nail. However, if the hole is larger than that, the patch becomes a little more complicated. In this case, you would still spread the plastic roofing cement over the hole, but then you need to place a piece of flashing on top of the cement. You should cut a piece of flashing out of the same material as the gutter in order to decrease the chances of corrosion occurring. Once this piece is cut, bend it to the shape of the gutter, and place it on top of the cement.
Repairing a joint
To repair a joint, you first want to remove all screws and other connecting hardware that hold the downspout and gutter together. Downspout and/or gutter sections may need to be removed as well before new sections can be inserted. After removing the necessary pieces, all caulk and adhesive around the joint should be cleaned off using a wire brush. At this point, the rubber gaskets on the gutters can be replaced. Finally, spread silicone caulk on the edge of one of the gutter pieces and put the system back together by pressing the parts together.
If you do these things, water should once again flow smoothly through your gutters!