I have a steel frame on its way to me with some slight rust showing up on the bottom of the frame below the crank and where the calipers fit into the frame. Short of having the frame stripped and repainted whats the best way to get rid of the rust for good? Is there a product/type of paint that could be used to repaint the small paint blemishes? Is there a product that can be used to prevent any rust inside the tubing? Thanks.