creosoting

from The Collaborative International Dictionary of English v.0.48

Creosote \Cre"o*sote\, v. t. [imp. & p. p. {Creosoted}
   (-s?"t?d); p. pr. & vb. n. {Creosoting}.]
   To saturate or impregnate with creosote, as timber, for the
   prevention of decay.