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Frankly it seems more risk than reward to coat inside the tank.
Never had the issue but it could just be a PM item, while keeping the cooling system in good shape, with fresh coolant filled without air trap, proper vent cap, temp sensor, water pump and LT thermostat, radiators with clear flow passage and elec fan working at both speeds with working resister, etc. to keep the temp cool and under proper pressure.
High temp, overpressure and oxidated coolant (from trapped air, cavitation) could cause plastic deterioration and excess stress to cause leakage from the tank, if not just aging and something to expect for 20 years old cars....
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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