DD 20261109T153158Z-58935 Guest: A good membrane shines. A tired one goes matte

DD Host: Today: why a membrane holds for years, and what gives it away a week before it goes.

DD Host: So why does it matter?

DD 20261109T153158Z-58935 Guest: So that, that's the b- big question. it matters because the, membrane holds.

DD Host: Right. And then what?

DD 20261109T153158Z-58935 Guest: Then it breaks. The water finds the weak point and it goes through all at once.

DD Host: How long does that take?

DD 20261109T153158Z-58935 Guest: Seconds, once the first crack opens. Before that it can hold for years.

DD Host: And when it does break, can you see it coming?

DD 20261109T153158Z-58935 Guest: Sometimes. The surface goes soft first, and you can feel it give under your thumb. That is the warning most people miss.

DD Host: So what do you tell them to look for?

DD 20261109T153158Z-58935 Guest: Look for the dull patch. A good membrane shines. A tired one goes matte a week before it fails.

DD Host: That is a useful rule.

DD 20261109T153158Z-58935 Guest: It is the only one I trust.

DD Host: So look for the dull patch. Thanks for listening.