I do mix in a little PVA glue which really helps with hardness and makes the surface very durable. Application is dead simple - put on a pair of surgical gloves, grab a handful out of the can and plop it down. Now hears the tricky part - dip you finger in some water and then just spread it around. It's kind of like finger painting but for super important war gaming purposes.
Warning: Tile grout can be caustic to exposed skin so don't just use your hands without latex gloves. It's also really hard to get out from under your finger nails once set.
The remaining steps are to paint the sides and apply the ground foam. that's maybe a total of 90 m minutes of work.
Time remaining until Historicon: 26 days, 11 hours and 25 minutes.