Working notes on pool and spa repair with epoxy putty. Numbers come from the Epoxybond technical data sheets. Where a job is outside what the material does, these say so.
Why an empty shell is the riskier option, and the order of work for a repair done with the pool full.
Three different clocks, one temperature curve, and the mistake people make quoting the 70 degree number in August.
Prep for each substrate, and why gelcoat is the surface people skip preparation on.
A rigid patch on a membrane under tension, and what to use instead.
The four situations where filling the crack makes the problem harder to find, straight off the data sheet.
What to do once it is hard: matching aged plaster, keying for paint, bedding tile on top.
Repairs around penetrations, where the leak is usually the joint rather than the shell.
Hotter water, smaller volumes, fish. What changes and what does not.