If you will be doing a lot of stream fording you might consider drilling a small weep hole in the low point of your BB shell. Water IS going to get in and you might want to give it an easy way out. Of course you will want to paint the raw edges of the hole to keep it from rusting. If you are going to apply frame saver you would want to, as a minimum, remove the BB and when it is out would be a good time to do this. Stripping the frame as HillRider suggests would be the ideal situation, but even a non-ideal application would be better than leaving it bare.