My first build (2016) '72 xs650

Oddjob said:

Sodium Carbonate can be found at any home improvement store that sells chemicals for maintaining swimming pools... its used to control pH...

https://www.rona.ca/en/sodium-carbonate

For the petcocks, it should be easy enough to make a blank plate out of flat bar with two holes for the petcock screws, and temporarily seal with silicone.

Don't give up, as you should be able to get good results with this method.

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