Stude Avanti Radiator Surge/Expansion Tank Repair. Like most of us, I have replaced the tank many times over the past 50+ years. I have had and made repairs from most major vendors but the tanks still seem to fail. I do run a 13# cap, etc. My question is: Has anyone used a liquid epoxy sealer/paint and tried to coat the inside of the tank? I know a few engineers that feel this would work and would hold up to the antifreeze/water solution, and the temperature and pressure limits. Also, what rating pressure cap do others run and does this help out the problem?