Rhodium plating Titanium & Gold rings

Hi

I have some rings in stock that are 18ct White gold and Titanium.
The white gold sections need to be rhodium plated. Do you need to
mask off the Titanum sections when rhodium plating the white gold?

I recall a manufacturer telling me that you don’t have to. However I
just rhodium plated a white gold and Titanium ring without masking it
off and it covered the ring in Rhodium.

Fran