What glue do I use to adhere Velcro to a plastic ball?

Could I ask what is your project/

Are you going to be pulling another piece of velcro apart from the one stuck onto the plastic ball?

Hi Thea, I normally use E6000. It doesn't eat plastic. Is you can't find E6000 here's a handy guide you can go through too - https://kitkraft.com/learn/best-glue-for-plastic-guide

Home Depot carries Velcro Glue, suitable for attachment of the Velcro strips to plastic, rubber, etc:

https://www.homedepot.com/p/VELCRO-Brand-1-oz-Tube-of-Glue-on-Adhesive-90065/203307569

Hello. They do make Velcro with adhesive on it that might be suitable for your project.

Otherwise I would suggest that white foam sticky double-sided tape that would be a great option. It is very strong and sticky and should be a good alternative. My husband used to work in the alarm industry and this white foam sticky tape holds alarm contacts boxes on windows and doors for years........ours have been mounted for 10 years.

Hi ! Use E6000 glue , works great on everything , you can find it at craft stores .

How about double sided tap?