Unirac flashloc-comp mounts

You're finding out why, without a true flashing approach, nothing is permanent. If you opt to do the quick fix don't settle for plain roof mastic. Use a high grade urethane sealant and clean and dry all surfaces as good as possible which will give the sealant the best chance to bond.

I've seen and inspected enough installs in my HOA (150+ and counting) to have the old idea confirmed to me again and again that regular, old fashioned flashing (or better yet double flashing which is what I had done) - when done properly - will provide the highest probability of fewest leaks over time.

IMO only, the methods that the solar industry and installers came up with to save time/labor and are done as a workaround for the standard and recognized ways of doing roof penetrations did a real disservice to the folks who put PV on their roofs.

I'm not trying to kick you when you're down, and again and IMO only, if the posts and other penetrations had been double flashed and you or your representative had sat on the roof and watched the penetrations being made (as well as other things), my educated guess is things would have stayed dryer at your house.

A lot of jobs that used the B.S. methods common these days will probably be fine for a while longer, but my guess is a lot of them are ticking bombs.

Now, you have a Hobson's choice: Replace the junk with real flashing and hope whoever does the fix knows what they're doing (and does a professional job), or reseal everything with caulk/mastic/whatever and chase leaks when it rains.

I'm sorry this happened to you, but you have company and the number will grow.

Thank you guys for reply!
What exactly is double flashing? I tried to google it and can't find anything.

Double flashing is easier shown than described in writing. A picture is worth a thousand words kind of thing.
For penetrations or PV posts/standoffs, it's basically, two flashings, one on top of another. The first one goes under the shingles/tiles but over the roof paper.
The second flashing which may not necessarily be of the same length and width as the first goes on top of the shingles or tile.

The other thing is that all my PV/solar supports are of the post type (which I suppose is not technically a roof "penetration"), not the B.S. methods developed by the solar industry that makes life easier/cheaper for the installer/solar peddler at the expense of roof integrity.

I've lived in my current home since 2005 and PV since 2013 and have had all the penetrations/vents/stanchions/panel supports done that way when having work done or solar devices added (and watched all the work being done BTW). No leaks (yet).

There are pictures all over the net. A competent roofer can give details. Just ask a good one.