My boat has been covered up for about 6 weeks now. We had a fairly mild weekend, so I broke out a hose and ran the engines for a little while before re-winterizing them. My Stbd. alternator was stuck hard. It took about 30 minutes of wiggling with a big set of channel locks to free it up and it is spinning freely now. One of my buddies says to spray corrosion block into the alternator to keep it from getting stuck during the winter. Is this ok to do? Any thoughts?