Finish the following sentence with the best choice: To water proof the wooden product.

Choices:
- Brush a coat of polyurethane always brushing with the grain. Before it dries and put 2 additional coats on it.
- Brush a coat of polyurethane always brushing with the grain. Let it dry and put 2 additional coats on it.

Answer:
Brush a coat of polyurethane always brushing with the grain. Let it dry and put 2 additional coats on it.