Reply by Grandpa

Wax is the preventative item for sure. You could cover the table with corrugated cardboard after waxing. Anything will work as mentioned. There are some other discussions on LJ about this and the common thing I got from reading it was WD40 is good for many things but it is not good on the cast iron table tops. I read a long thread and found that the one common thing in it was the people that used WD40 had a common rust and discoloration problem. I have read that you can use white vinegar but I have never tried it. Wet a towel with white vinegar and lay it on the table over night. Like I said I have not used this myself but I have read it in a magazine. There are other products for this out there but they all cost. then again a band saw with a cast iron table is not an inexpensive item either.