Long time lurker, first time poster.

My technique for freezing cum is as follows:

I buy 5ml plastic vials online (about 10 dollars per 50 on Amazon). This is perfect for me as I regularly produce just the right amount of cum to fill them up. When I'm ready to make a deposit, I'll uncap a new vial and pre-fill it with wine preservative, which is basically just inert gas (argon). I then hold the vial to my "tip," and when I cum it fills the tube. Excess gas in the tube is displaced as I cum. I then rapidly "top off" the tube with a small amount of wine-preservative gas and cap. I then get the cum into the freezer as quickly as possible. In the freezer, I have an aluminum "dry bath," that I also picked up online. It's basically a big chunk of metal with holes that are the same diameter as the plastic vials. Because the vial full of cum is in direct contact with a large frozen metal block, the cum freezes very quickly (air is actually a poor conductor of heat/cold, and I want the cum to freeze rapidly).

I've found that this method, which I use to minimize the the amount of oxygen the cum is exposed to (ideally none at all) and to fast-freeze, leads to a great quality product when re-warmed. It's quite similar to freezing food, in fact... same theory. To warm, I just place as many vials into a warm water bath as I want. Typically, I only re-warm 2-3 at a time. The final product, when re-heated to body-temperature, is almost "as good as fresh." I've noticed the consistency to be thick and viscous, and it's still quite stringy.

The downside is that this method is costlier both in terms of materials (I never re-use the vials) and space. But I love the results.

I can provide more information if this isn't descriptive enough. Hope my ideas help!