Yes, you can pour polyurethane on top of itself and it will stick within it's total cure time of seven days. Silicone will also stick if you pour within the total cure time, but can be more difficult.
Yes, you can pour polyurethane on top of itself and it will stick within it's total cure time of seven days. Silicone will also stick if you pour within the total cure time, but can be more difficult.