Simple plastic sheet test" makes me think of my uncle's old greenhouse. He never checked for leaks either, fiona749, and the whole thing just pooled water until it collapsed one winter. Some people just learn the hard way.

Honestly used to think getting paid in cash, any cash, was a win. That story about the pennies changes the math. It's not payment, it's a power move wrapped in a hassle. Makes a bank transfer look pretty good.

Mixing a test patch is just extra work for no real gain. If you've used the same grout before, you already know how it acts. That tip sounds like something from people who overthink every little DIY project.