Using talcum powder with tubes

[Synchro909]

Originally Posted by noboD

Don't use plain water, use soapy water from a sprayer.

Or immerse it in the bath but don't allow yourself to be confused by the soap bubbles.

[TomInCologne]

you can also use 'leak detection spray' which is used for checking gas pipework. You should be able to get it in your local diy...