Limiting sap bleeding when reducing spruce height?

I have a couple of collected spruce that are nearing the point where I want to start work on them. I want to reduce the height by 1/3 to 1/2. Other than working on them during the fall or very early spring, what can be done to reduce sap loss, as these are very apically dominant trees (white spruce). I have heard of people using wire tourniquets and various sealants and cut pastes. I'd like to hear from those more experienced with this genus

None sap loss.

I did make this while dormant.

May not work as well with sap already flowing.

Reckon a tourniquet would have to be put on and left till the branch dies to work.
I put one on and cut a different one and it didn't do anything.

Sorce

Good to know. You're always a good help Source

sorce said:

Sorce

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Tycoss said:

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Sorce

IMHO, the best times to prune are after the new foliage has hardened (Jul/Aug) and I've not noted any problems with excessive resin bleed then.

I must confess that I've never felt inclined to whack away at spruce in the spring time. So, I have no idea what kind of gooey mess might result. I look at conifers as trees that I work on summer and winter so that I have time to take care of my deciduous trees in spring and fall. Do you not have any deciduous trees in your collection?