One of the best for this purpose is polyvinyl alcohol. When injected into the water right at the stem of the boat it reduces thickness of the attached boundary layer and therefore reduces drag. But maybe cats go too fast for this to spread out and be effective.
Dacarls:
A-class USA 196, USA 21, H18, H16
"Nothing that's any good works by itself. You got to make the damn thing work"- Thomas Edison
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