Ok, so I am new to this school bus thing. I have always wanted to convert one. So I just bought a 2000 Bluebird with a 24 valve Cummins engine. 154000 miles. I took out all the seats, all the inside metal , insulation, and now working on the floor. The rust is not real bad , but I don't want it to get bad either. So my question is, how do I get rid of the rust that is there and how do I prevent more rust? Is there anything I can put on it to stop it from spreading? Also there is holes from seat bolts and nails. How can I patch these many holes to prevent moisture from getting in? Thank you in advance.