Pouring emulsion on glass is an art. I had it dripping from my elbow the first time I tried, and Mark was trying hard to stop laughing. You pour at between 100 and 110 deg F onto a slightly warm plate, say 75 F. The room we have coated in varied from 68 to 75 deg F. The emulsion was kept warm in a warm water bath but not hot. Heating causes increased fog.

Alcohol is a spreading aid and decreases bubbles but is not a surfactant. A surfactant would be Photo Flo 200 or Foma Flo, or something like that. They usually contain propylene glycol and polymeric ethers. They are usually nonionic or have negative charged Sulfonic acid groups on them, and so they are usually sold as Sodium salts of the ionic material.