Plat 25 Use time

No you can use it sooner than that. The seven days is the full cure time but you can use it before that. If the area is warm enough, it won't even take a full 18 hours before you can demold. I've used mine at 24 hours after pouring before and if you don't feel comfortable using it before you're sure it has hit full cure, you can warm the mold to speed up the full cure - instructions on this should be on the data sheet for it.