From The Collaborative International Dictionary of English v.0.48:
Crust \Crust\, v. t. [imp. & p. p. Crusted; p. pr. & vb. n.
Crusting.] [Cf. OF. crouster, L. crustare. See Crust, n.
]
To cover with a crust; to cover or line with an incrustation;
to incrust.
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The whole body is crusted over with ice. --Boyle.
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And now their legs, and breast, and bodies stood
Crusted with bark. --Addison.
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Very foul and crusted bottles. --Swift.
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Their minds are crusted over, like diamonds in the
rock. --Felton.
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