>Here is another question...HSC is used only for the brood box? If I do not use a queen excluder on my hives, does that mean I have to use HSC in each box? That is pricey eh?
If the goal is instant regression, you really only need one bee box full of HSC to get them regressed. By the time they start drawing the next box, some of the offspring from the HSC should be drawing it so it can be wax 4.9mm or foundationless and come out fine.