Winterize It Pro, Jet Ski, Outboard, Waverunner, Yamaha, Suzuki, Mercury, Honda Winterize It Pro is the first winterizing and storage solution in a aerosol can for your cooling system Protect & store your marine engine using this quick and easy method that is perfect for outboards and personal watercraft. interizing your marine engine with Winterize It Pro at the end of the season is the best way to guarantee that next season is full of fantastic on-water adventures, because a properly winterized engine will be clean, safe and ready to run come spring. Up to 90% faster, Virtually no mess, No tools required. Winterize It Pro is safe to use on all engines. It does not contain any harsh chemicals