While in Tajikistan, I slept out in the open one night. Problem was that it was dark when I put my sleeping mat down. In the morning I pulled out two big thorns from the mat, leaving some nice punctures.
I did however have a thermarest repair kit with me, and today I got around to fixing the punctures. Here’s how:
How to Repair a Punctured Thermarest
Get the kit ready.
Mark the puncture with a circle slightly larger than the patch. You may need to put the fully inflated mat into a sink full of water in order to find the leak (look for bubbles).
Chuck the hot bond in boiling water for three minutes.
Remove the hot bod from the water, rip it open, and apply it to the thermarest, kneading it into the fabric with the applicator. Then put the patch onto the glue. You have about 45 seconds when it is cold in order to get the glue applied and the patch on.
Put a plastic bag over the patch and glue, and then place the pot of boiled water on top for 60 seconds. According to the instructions, the hot pot will not damage your thermarest if the valve is open.
Remove the pot and immediately roll over the patch a few times with a cyclindrical object such as a metal water bottle (you can easily peel the hardened glue off the bottle afterwards).
Leave the thermarest undisturbed for 10 minutes. The mat is now ready for use.