Hi @earlmonk :)
The reinvest happens before payout so technically with 100% reinvest there is no payout - only 0.001 SBD to send the message.
So both SBD and STEEM income are being reinvested to virtual STEEM POWER and you dont have to do anything :)
RE: @tipU Investors Report 26.09.2018: HF20 Problems