This is a moldable adhesive, quite similar to epoxy. I like it due to the option of different colors. The cons is that it is not so flexible as mentioned on advertisement (become very hard), it is for a single use, it means once open the envelope You need to use everything and it takes around 24 hours to cure (in opposite to what is mentioned on advertisement).
Online store: AliExpress
US $2.29 20% OFF|For V tie Moldable Glue Self Adhesive Clay Self Setting Silicone Polymer Dough Clay Repair Rubber Tools DIY Accessories-in Clays & Doughs from Home & Garden on AliExpress
2.29 USD