I have had a small leak on the roof over the front porch. I found that there is one spot where I have to apply a bit of "Snow Roof". It works fine but needs to be re-applied once a year.
Of course I never remember to until it starts to leak...and once rainy season hits I have to put up with the leak for months waiting for the seasonal rains to stop and for the area to thoroughly dry out.
For whatever reason I got out there yesterday morning and got the job done. I beat the rain by about 8 hours this year!