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You can buy regular Sanding Sealer at the paint or hardware store. Just don’t use any solvent based paint over it.
Sometimes I like to use balsa and water putty to represent aged concrete, for bridge abutments, piers, wall foundations etc. It's very easy to work, sand and emboss. I wouldn't use it for building walls etc for reasons already noted by others, but it does have its uses.Pics below.Otto K.