Please choose the correct solution to the question: To water proof the wooden product.

Solution1: Brush a coat of polyurethane always brushing with the grain. Before it dries and put 2 additional coats on it.

Solution2: Brush a coat of polyurethane always brushing with the grain. Let it dry and put 2 additional coats on it.

Answer format: solution1/solution2
Answer: solution2