I will be painting a section of a bath/shower which consists of several curved sections of plaster (I think) surrounding glass block.  The wall in question is in need of minor repair and will require some limited touch-up.  In making the repair, should I use plaster or is there a better material?  I DON’T want to completely redo the bath, but I would be willing to apply a “skim coat” to the existing wall.  In discussing the type of paint to use, several have recommended a water base epoxy, while others have suggested a marine product.  Any suggestions and/or experiences?

Thanks Bill