Alan Smith Pools is happy to help you with the initial water treatment.
A fiberglass coating is something I would not apply to my skin. Methyl Ethyl Ketone is the catalyst for isophthalic compounds - no Bueno An epoxy is safe to roll on. Be aware of the fumes and gases that can be inhaled when you apply coatings in areas not ventilated.
Paint: While paint is not an ideal long-term solution for your pool, it can be a cost-effective choice. The Band-Aid will give you some time to save money for future pool renovations.