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So ive recently acquired some big sheets of white styro foam and I know there not good to use for making terrain so I decided to cut out some hills with them and then I covered them with plaster of paris mixed with sand and then after that I brush painted them now im wondering after all of that would it be fine to clear coat them with spray paint clear coat or with that still eat the styro foam, thanks.

Provided you left no bare foam patches, you should be fine.

Exposed foam will be eaten away by the spraypaint and/or propellant - even pva seals adequately to protect foam from spraypaints.

Ok thank you for the help, and I know people have just put watered down matte paint in a spray bottle and then spray it with that.