Fuel Tank Pitting_ how much is too much?

[BA17]

Looking at the fuel tank today and pulled off the rubber strips that apparently were installed by the tank manufacturer. The only pitting on the tank is under the rubber strips. Very little pitting overall on the tank. This is the worst area on the tank and I am wondering if this one spot has killed the tank? I dropped it by the local welding shop and they are going to look at it and determine if it can be repaired? Anyone have a fuel tank repaired?