Radiator rust can eventually lead to leaky radiators, as sludge builds up within the radiator causing them to rot from the inside out. This sort of leak is commonly known as a pinhole leak.
Whilst there are no real solutions for a leaky radiator caused by rust, a temporary fix can be implemented, as is explained in our dedicated blog, How To Fix A Leaky Radiator. In following the advice listed there, you can obtain a non-permanent solution before the installation of your new home radiator.