The 2 part epoxys are really beautiful for effect, but very expensive and you have to do it perfectly or it wont come out right, and - it has to be non reactive if its in a chem lab.
anything done in a classroom would have to be run by the admin/principal/board and so on or she might be written up or worse.
some official from the table manufacturer or supplier would have to actually let the school know what surface would be officially safe to use in a chem lab room, with MSDA forms - everyone already knows they will just say "replace the tables".
Face it, the only people who need to have the tables fixed asap are the KIDS! and their needs come LAST! By the time the dust clears from all the paper pushing for this project these fifth graders will have children of their own going to school here and your daughter will be ready to retire. (that's the reality of trying to do something nice these days) sharet