Allow 24 48 hours dry time yes avoid any rainy days in the forecast and you should be good to go.
Repair leaky gutter corner.
Find the crack and scrub the area around it to give way for a small plastic replacement sheet to fit into place.
Often aluminum guttering will start to leak from.
This video takes a look at how to repair aluminium guttering to a good standard that should last many years.
In the category of professional caulking compounds the polymer and tri polymer caulks are excellent choices for repairing leaky gutters and sealing new gutter installations.
You need to remove the old caulking.
One brand of tri polymer caulks the ct1 sealant is a hybrid polymer formulation that contains no solvents.
If you have a little standing water try to dam it up away from the corner using a sponge or an old rag.
The bond will not be permanent and the leak will eventually return.
Remove the old silicone caulk from the joint connection.
Feather the roofing cement out on the surrounding area to flatten any steep edges.
Bend the strip to fit and embed the flashing in the cement.
Use steel wool and gently scrub the crack to make the surface clean and stamped.
Rain gutter spikes or screws should be at least seven inches long and eight is even better.
If water is leaking where the gutter and downspout jointly connect repair the joint connection.
Scrubbing the crack reach your gutter by using an extension ladder.
Finally thoroughly clean the area of dirt debris shingle granules etc so that the new repair will hold properly.
You cannot add more caulking to old.
Use a commercial grade gutter sealant and simply re apply where needed in a thorough manner.
Apply plastic roofing cement over small holes.
Repair leaking joints with silicone caulk.
Clear all debris out of the gutter miter.
If the holes are larger than nail holes use tin snips to cut a strip of flashing the same amterial as the gutter wide enough to fill the area.
Take an abrasive pad or wire brush and scrub the debris away from the leaky area.
This means the caulk will not shrink as it cures.
You first need to clean your gutters thoroughly.
If the precise source of the leak isn t clear spray the area with a garden hose to identify the crack hole or gap where water is seeping out of the miter.