You can use any product that is 100% silicone. They are available at hardware stores or Walmart and they will come in various colors including clear. Just make sure you do not have any pets in the cage at the time you are using it and that it has fully cured with no odor before you put them back in. Silicone has a very strong smell to it as it is drying and the fumes could harm your pets. Once it is fully cured and no longer smells it is completely safe.