Question about 5200 sealer

[Giorgio]

My friend found a small leak in the motor well by the scupper and his question is, can 5200 be put on wet, while the boat is still in the water or does he have to take the boat out of the water, then let it sit for an hour or so? He asked me and I wasn't sure, I thought we would have to take the boat out and sit for a while. When I used 5200 on my boat, she was always out.