Step 1: Materials
Hot Glue Gun
Step 2: Disassembly
Step 3: Waterproofing
2) Once the glue is hot enough to stick, coat one side of the flash drive in it and push it into the casing (Make sure there are no air bubbles).
3) Coat the other side and attach the other side of the casing, and reassemble the flash drive
4) Coat and smear glue onto the seams where both sides of the casing meet