Mikepier wrote:
I can't tell if its a continuous bead or just dots.But it seemed like
the whole shingle was sealed down. In any event, I noticed water
coming out when I lifted the shingles.

It's a continuous bead of dots. The dab of roofing cement on the
nail heads can fix these things a lot of times, but the real question
is why is there so much water under those shingles. There should be
none or close to it.

Now you have to find out why water is getting under those shingles,
otherwise you're just covering up the problem. There might be some
out-of-order flashing/layering near that valley termination that's
shunting water under the shingles. Need to see it. Take some pictures
where you did your patching and post them.

R