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Hi Sara

Is the purpose of the paint water proofing or corrosion protection?

Check out the link for a product for waterproofing the roofs of masonry/concrete tanks. https://resapol.com/wp-content/downloads/datasheets/data283.pdf.

I am not aware of paints specifically for the inside of tanks, and I would not be confident that the above product would be satisfactory under pressures that would be encountered on the walls of a water tanks. In the past bitumen was used in joints but I think this practice is likely to be frowned upon at this point, as I think modern practice would be to provide internal water proofing measures at the construction phase. If you have access to the BSI online there is a section within BS 8110 (Structural use of reinforced concrete) that deals specifically with the design and construction of water retaining structures-https://lms.iesl.lk/pluginfile.php/2331/mod_resource/content/1/8110%20Part%201-1997.pdf. This standard has been superseded by RC Eurocode, but the Provisions of the Eurocode are likely to be broadly similar.

You could try googling "Tanking Products". These products seem to be mainly aimed a damp-proofing basements, and are unlikely to function under the pressures that would be encountered in a reservoir. If the purpose is not water proofing then I think you would ok using a non oil or lead based acrylic paint. If the purpose of the paint is corrosion protection then I think modern practice would be to provide so form of cathodic protection. You could have a look at https://resource.npl.co.uk/docs/science_technology/materials/life_management_of_materials/publications/online_guides/pdf/cathodic_protection_in_practise.pdf to see if this is a potential solution to your problem.

Hope this helps

John