EXHIBIT 23 ---------- CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statements Nos. 2-89135, 33-28533 and 333-15377 of North American Galvanizing & Coatings, Inc. (formerly Kinark Corporation) on Forms S-8 and No. 333-61393 on Form S-3 of our report dated April 12, 2005 appearing in the Annual Report on Form 10-K of North American Galvanizing & Coatings, Inc. for the year ended December 31, 2004. /s/ Deloitte & Touche LLP Tulsa, Oklahoma April 12, 2005