Last month I mentioned that the Eevee render engine in 2.8 doesn’t support holdout functionality for render masking. I learned today that this WILL be added in 2.81; in fact it was just recently added to the nightly beta builds. So there’s that problem solved I suppose – no need to put it in your video, Wayne. My understanding is 2.81 will come out somewhere around November (though we know how release dates like to drift).