Perhaps others have discussed this; I did a search and found nothing.
I’m sure you’ve had the same problem I’ve had with Sriracha and other condiments in plastic bottles – after a couple months, a few uses, a few temperature changes (bottle waits patiently on counter while grilled cheese reaches perfect grilled-ness before you can squirt the perfect medallion of condiment). You reach for the bottle and it’s taken on properties from The Blob and there is a wretched ring of stickiness encircling the cap.
Others may have shared this little tidbit, though the answer arrived independently to me when I felt betrayed not only by Sriracha but also Grey Poupon. Come on! Grey Poupon, with sticky ooze? Horrors! Now, I buy it in jars again, but the cure works for GP too.
A bucks worth of plumbers tape will seal all your bottles for as long as you need. Just apply the tape to the thread as if it were a pipe, et voilà.