Red Devil 06970I RD Pro Butyl Rubber Sealant, 10.1 Fl oz (300 ml) 1-Pack, White

Seems to work well. Difficult caulking job but was very sticky and has remained flexible.

I was surprised to find this. But happy. It’s no quite as firm as the tape. But seems to be a good product

This stuff is what you want. It is worth every penny. I used it to caulk my sill plate to my basement foundation before tape flashing. I had to remove a star because one out of 6 had a big air void in it and caused problems and left me with less product. Other than that, I highly recommend wearing disposable gloves and bring a plastic caulk tool.

Worked great for sealing a plastic tank

This is more expensive than the clocks you can get at the big box stores, but this is what our structural engineer recommended for a crack developing in a brick wall. It's kind of messy to use, very, very sticky, and it takes a long time to cure. But it is incredibly durable and better than the cheap stuff.

This product was hard to find but not on Amazon, Is available when you need it and fast service

Used plenty of tubes to seal up a metal roofed building that had some leaks along several long seams in the painted aluminum sheets. It was a hot day in Eastern Oregon and the metal was hotter. The product went into the voids easily and did not run back out of the cracks. We had purchased some aluminum tape to cover the joints just in case it began to run, but we didn't need to use it.

Use disposable gloves if you are not comfortable dealing with sticky caulking.