Pool Plaster Formula

[Phillbo]

You might find some useful info in this write up ... if you have not already seen it.

http://www.truetex.com/pool.htm

[CarlD]

I also suspect that different mixtures of plaster from manufacturers have different formulations--and different ways to mix it depending on the application. But as Ben says, application of "mud" (as all kinds of masons call the sludge they use, from mortar to plaster) is a critical technique that affects adhesion, durability and appearance. Even simple spackle gets more plastic and applies nicer as you work it on the hod for a while.