A square foot of Plexiglas can hold no water. It is a flat sheet. A cube of Plexiglas would be needed.
Plexiglas weighs less
A plexiglas box is a light transparent weather resistant thermoplastic container.
The density of plexiglas is rho = 1,190 kg/m³ or rho = 1.19 g/cm3.
The advantages of Plexiglas compared to that of normal glass are first that Plexiglas cost a fraction of the price, second it is very durable and wont shatter like glass.
Plexiglas
Plexiglas was registered in 1935 by Delaware company Rohm & Haas, and appears to be owned by a French company called Arkema. The most recent related registration, for Plexiglas Edge FX in 2005, was by Arkema directly.
Paint
Methyl Methacrylate
Yes
Rubbing alcohol as soon as possible. Plexiglas is a bit porous and the die can get into it if left for any length of time.
Lucite