chevrolet - Lapping valves by hand - does the compound have to be

I'm hand-lapping valves on the LS1. This is probably a silly question, but I just wanted to confirm that I have to wipe off the lapping compound prior to the hydro test.

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Valve Hand Lapping Grinding Tool Kit 2 Piece Set Suction Cup Lap Sticks FREE SAME DAY SHIPPING FROM US Features: Heavy duty rubber suction cups.

Valve Hand Lapping Grinding Tool Kit 2-Piece Set Suction Cup Lap Sticks