After patching a tube, I always put some air in it and let it hang over night to make sure it still is holding overnight where I fixed it and to make sure there are no other holes before I put the tube back in "rotation" for use.  With these patches, they bubble up over the hole as they are a bit softer and more flexible that other patches I've used.  Specifically, when I have a pin hole in a tire and use this patch, it blisters up over the pin hole about 1/4" in diameter and 3/16" tall, about like a half of a green garden pea.  It looks like a fluid filled blister you get over a burn on your skin.

I don't put a lot of air in the tire, just over the size it would be in a 700x23 tire.  Basically just enough to hold it's shape.

These patches always bubble up if I leave them hung up inflated very long. I just let them hang for 30 minutes or so now.  Just long enough to make sure there are no other holes.  Even then they still bubble up though,like 1/16" x 1/16" in size.  You can see where the pinhole is under the patch.  I've never had any other patch do that.

Doesn't seem to be a problem in use, but I did have one of the bubbles pop when I hung the tube over night.

I'll use these up, but won't be buying these again.  They seem to be a bit too flimsy.  I'll also not use them on anything other than a typical small pin or nail hole.

One the bright side, since they are so flimsy, they bond well with the tire and don't have as much of that pinched look when you inflate the tube.
After patching a tube, I always put some air in it and let it hang over night to make sure it still is holding overnight where I fixed it and to make sure there are no other holes before I put the tube back in "rotation" for use. With these patches, they bubble up over the hole as they are a bit softer and more flexible that other patches I've used. Specifically, when I have a pin hole in a tire and use this patch, it blisters up over the pin hole about 1/4" in diameter and 3/16" tall, about like a half of a green garden pea. It looks like a fluid filled blister you get over a burn on your skin. I don't put a lot of air in the tire, just over the size it would be in a 700x23 tire. Basically just enough to hold it's shape. These patches always bubble up if I leave them hung up inflated very long. I just let them hang for 30 minutes or so now. Just long enough to make sure there are no other holes. Even then they still bubble up though,like 1/16" x 1/16" in size. You can see where the pinhole is under the patch. I've never had any other patch do that. Doesn't seem to be a problem in use, but I did have one of the bubbles pop when I hung the tube over night. I'll use these up, but won't be buying these again. They seem to be a bit too flimsy. I'll also not use them on anything other than a typical small pin or nail hole. One the bright side, since they are so flimsy, they bond well with the tire and don't have as much of that pinched look when you inflate the tube.