evster wrote:My mc21 tank has rust inside it and I’m not comfortable running the bike off petrol that is in contact with it. I want to get it lined/treated with POR-15. Would any of the learned folk on here recommend it or have any suggestions on alternatives to resolve the tank issue?

I know what you mean - some of the results I’ve seen have been horrendous
Try these guys - their paid for service rather than the DIY option is what you want

https://www.rttmotorcycles.co.uk/products/professional-motorcycle-tank-sealing-service

From their gallery
https://www.rttmotorcycles.co.uk/pages/tank-sealing-service-before-after
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Nick

Rebuild project NSR250 MC18 R4J