Working from the inside, we RotoZipped a 12-inch strip of drywall off the entire bottom of the drywall along the exterior walls and a few interior walls loaded with bottom plate punctures.
We sprayed the elastomeric along the bottom plate sections, and then went back over the sprayed areas with a 2-inch brush to touch up any areas we missed.
Using a hand-held hopper and gun, we are able to move quickly, covering nail plates, copper pipes, and the framing plates with a flexible seal in about 30 seconds.
The stuff goes on milky and dries clear.
Leaks through a plywood subfloor with gaps and holes also pulled crawlspace air inside. Here in the living room, where the floor is to be covered with carpet, we applied a flexible, airtight coating, 1mm to 2mm (one to two dimes) thick. This took about five to six seconds per foot.
Leaks low on the building included penetrations through the floor that pulled air up from the crawlspace because of stack effect.