Hi all, there is a new sefer torah that has a beautiful ksav but I have already been called a few times to fix it for moisture damage. Once it had what looked like a drop of rain that had maybe fallen from someone's hat, and once it had what was obviously a spit mark that had caused a negiya. The ink seems very water soluble and it's making the owner nervous, as twice already they put it back during laining. While I explained that these things happen, he asked me if there were any preventative measures that could be taken to waterproof the ink, such as spraying the sefer with fixative?
Anyone have any ideas or experience?