I have to be honest, I am not familiar with the ultrasonic fogger you posted or how it works so i cant give you an opinion about it. I am using a Pro-mist system from Pro-products on a short cycle duration timer. It works well for me. I also use their radiant heat panels, they have the best warranty in the business (10 years on their panels, 4 years on the mist pump.) Yes the poly is a brush on application and for 8 cages I would say you would need about 2 gallons. I like the water based poly by Varathane. Quick question, instead of getting 8 separate thermostats why don't you just get 2) Herpstat4, one for the 4 foot cages and one for the 6 foot cages? One unit will monitor 4 separate cages.