Hmm you should search on this very forum. Actually there are quite a few ppl who tried a 'custom' direct core cooling.
What they learned was, one can't fight fluid dynamics laws.
Any system 'shooting' water on the core wont be efficient because of two main reasons:
1 - the exchange surface area is *very* small. Way smaller than in a WB. And you want the water to stay "longer" in the wb ie you need a longer path to optimize transfer
2 - the core is square and flat. The flow just over the core will be quite laminar, ie not efficient, whatever the way you 'shoot' water at it.
Overall it wasnt *so* bad (because of direct heat transfer), but it didnt outperform a Maze2.
Now about lapping. The finer the finish, the finer the past should be.
Rough finish -> arctic silver. Thick, with big particles
Mirror finish -> no-name quasi-fluid white 'goopy' paste. So fluid it will squirt on all sides. Apply only a film under the wb where the core will sit.
Of course mirror finish is better for obvious reasons...
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