Is it OK to tank over rapid setting render shortly after it sets?

[SergeTiler]

The rationale behind the rapid setting mortar is to speed up the work. At the same time, a tanking system essentially traps any moisture inside. It seems to me that tanking shortly after the mortar sets (in, say, one or two hours) is a leap of faith. What do you think?

 

[demi34]

I would leave it 4-5 hours