I have a formula for subbing here somewhere. It involves organic solvents mixed with organic polymers and gelatin along with acetic acid. Basically, it is both hydrophobic and hydrophylic or you might say it has a bipolar disorder.
It does require a fume hood and lots of ventilation to coat.
Estar subbing is entirely different than Acetate subbing. Estar often requires electron bombardment to give it a tooth. See posts by HRST.