I've used them to attach the 20mil membrane to fondations sprayed with polyurethane and to my surprise, they worked great. Because the surface is so irregular, I would have needed twice as much as I thought. Couldn't find something as good at the store.

The cement block in my crawl space was a little damp making the double stick tape not the best option. So after speaking with Larry he recommended going with the pins to secure the 12 mil and then the polyurethane caulk just above it to make a nice waterproof seal. As usual, Larry was right on the money and it worked great. I recommend getting one more bag of pins (or a tube of poly) than you think. It's better than having to reorder, pay shipping.and more importantly, having to stop your progress.

Easy to install once hole is drilled, just lightly tap in or they will bend over and snap off

Don't try the installation without the pins! They work great and really save a lot of wasted effort. While the double sided tape is great, the weight of the barrier is enough to pull it down. Working in a low crawl space, I placed the tape around the perimeter with the outer paper intact. I then worked a few feet at a time with the tape and pins. Worked well for me!

Product sticks even to damp surfaces, easy to use