It is basically the consistency of melted marshmallow.
You don't have very long to pour it before it starts expanding.
You have to be very careful if you are putting it into a confined space like under a deck that is already down.
This stuff exerts a lot of force as it expands and needs a lot of room for the excess to go to.
We did the hull and then trimmed it back flush to the stringers before the deck went down.