Hydro-shield is absolutely the best on the market. I've been using them on every deep-v boat I've owned for 20 years. They don't stop working when the anti-ventilation plate is out of the water and also protect the prop against bottom strikes.
https://www.hydro-shield.com/
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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