Problem that most people here are not recognizing is that when you back hot bearings into the water the instant cooling causes them to suck water into the bearing chamber. I have used buddy bearings for 40 years and I just make sure I keep them at least 1/2 full. Make sure you use a marine grease. I always make sure a little grease leaks out of the rubber in the back of the bearing and I have never blow a seal. Bearings get repacked every 5 to 10 years and I have never had a rusty or blown bearing.