APPLYING A SACRIFICIAL COATING TO WROUGHT IRON, CAST IRON AND STEEL


PART 1---GENERAL

1.01 SUMMARY

     A.   This procedure includes guidance on applying a
          sacrificial wax or linseed oil coating to wrought iron,
          cast iron and steel features.

          NOTE:  CLEAR, NATURAL COATINGS ON EXTERIOR WROUGHT AND
          CAST IRON SURFACES ARE NOT RECOMMENDED EXCEPT IN
          EXTREMELY LIMITED CASES.  WHEN EXPOSED TO THE ELEMENTS,
          THESE TWO MATERIALS WILL RAPIDLY DETERIORATE.  CLEAR,
          NATURAL COATINGS SHOULD BE LIMITED TO ORNAMENTAL PIECES
          ONLY.  EVEN LIMITED USE REQUIRES A HIGH DEGREE OF
          DILIGENCE IN MAINTAINING THE COATING.  IDEALLY, SUCH
          COATINGS SHOULD BE LEFT TO INTERIOR WROUGHT AND CAST IRON
          SURFACES.

     B.   See 01100-07-S for general project guidelines to be
          reviewed along with this procedure.  These guidelines
          cover the following sections:

          1.   Safety Precautions

          2.   Historic Structures Precautions

          3.   Submittals

          4.   Quality Assurance

          5.   Delivery, Storage and Handling

          6.   Project/Site Conditions

          7.   Sequencing and Scheduling

          8.   General Protection (Surface and Surrounding)

          These guidelines should be reviewed prior to performing
          this procedure and should be followed, when applicable,
          along with recommendations from the Regional Historic
          Preservation Officer (RHPO).

     C.   For guidance on cleaning and paint removal of wrought
          iron, cast iron and steel, see 05010-05-R, 05010-16-R and
          05010-17-R.


PART 2---PRODUCTS

2.01 MANUFACTURERS

     A.   Butcher Polish Company
          120 Bartlett Street
          Marlborough, MA
          617/481-5700

2.02 MATERIALS

     A.   Paste wax such as Butcher's "Boston Polish Wax" or
          "Bowling Alley Wax" (Butcher Polish Company), Trewax
          Clear, or approved equal.

     B.   Beeswax

     C.   Turpentine

     D.   Linseed oil:  Available from hardware or paint store.

     E.   Emery cloth

     F.   Soft cloths

2.03 EQUIPMENT

     A.   Fiber bristle brushes (1/2 to 3/4 inches long)

     B.   Portable propane torch


PART 3---EXECUTION

3.01 PREPARATION

     A.   Before recoating, remove all traces of rust, corrosion,
          scale and old paint leaving the surface completely clean. 
          For guidance on paint removal, see 05010-05-R, 05010-16-R
          and 05010-17-R.  

3.02 ERECTION, INSTALLATION, APPLICATION

     A.   Refinish with Wax:

          1.   Wax metal piece with paste wax, or a mixture of
               beeswax which has been dissolved in a bit of
               turpentine.  

               NOTE:  DO NOT USE EMULSION TYPE WAXES.

          2.   Let sit for fifteen (15) minutes.  

          3.   Buff with soft cloth.  

          4.   Rewax every one to three months depending on the
               severity of the exposure.

          -OR-

          Refinish with Wax and Linseed Oil:

          1.   Gently heat piece with a portable propane torch.  

          2.   Wipe with emery cloth.  

          3.   When cool, rub a combination of beeswax and boiled
               linseed oil into the surface with a soft cloth.

          4.   In exterior locations the beeswax and boiled
               linseed oil should be renewed yearly.

3.03 PROTECTION

     A.   Protect cleaned or final finishes from damage during
          building or project cleaning period by use of temporary
          protective coverings approved by RHPO.  Remove protective
          covering at time of Substantial Completion.

                          END OF SECTION