Use a thin CA glue made for RC tyres. It wicks into the bead and bonds the tyre to the wheel. Clean both surfaces first and hold until set.

Thin CA is runny and wicks into tight seams and tyre beads. Medium CA is thicker and fills small gaps, which suits general repairs.

Fit the tyre, lift the bead a little and run a thin bead of CA around the join on both sides. Let it cure fully before running.

Yes, CA thickens over time once opened. Store it cool and sealed, and a small bottle you use often is better than a large one that sits.