Applying Hot Wax To Outdoor Bronze

Procedure code:
501004S
Source:
Outdoor Sculpture Manual - Center For Public Buildings
Division:
Metals
Section:
Metal Materials
Last Modified:
03/03/2017

APPLYING HOT WAX TO OUTDOOR BRONZE

PART 1---GENERAL

1.01 SUMMARY

A. This procedure includes guidance on applying a hot wax sacrificial coating to outdoor bronze. This barrier helps prevent harmful atmospheric      pollutants from contacting and reacting with the surface. The application of hot wax to a heated surface, followed by sacrificial coatings of cold paste wax should provide the maximum bonding and protection.

B. Apply as needed to restore maximum protection following the removal of older wax coatings.

C. For general information on the characteristics, uses and problems associated with bronze, see 05010-03-S.

PART 2---PRODUCTS

2.01 MANUFACTURERS

A. www.Chemindustry.com (search engine for the chemical industry)

B. Museum Services Corporation (MSC) www.museumservicescorporation.com

C. Conservation Support Systems (CSS)www.conservationsupportsystems.com

 

2.02 MATERIALS

OTE: The wax product selected should be a synthetic microcrystalline wax including natural carnauba wax forming a blend.

A. Outdoor Sculpture Wax (MSC), or approved equal

B. Sculpture Wax (CSS), or approved equal.

C. Cosmolloid 80 H (if needed per manufacturer's product guidance)

D. Benzotriazole (BTA) corrosion inhibitor (MSC or CSS),

   or approved equal (if needed per manufacturer's product guidance)

NOTE: BTA has been identified as a chemical with health hazards; following manufacturer's Material Data Safety Sheet for guidance for safe use.

E. Mineral spirits:

   1. A petroleum distillate that is used especially as a

       paint or varnish thinner.

   2. Other chemical or common names include Benzine*(not Benzene); Naphtha*; Petroleum spirits*; Solvent naphtha*.

   3. Potential Hazards: TOXIC AND FLAMMABLE.

   4. Safety Precautions:

       a. AVOID REPEATED OR PROLONGED SKIN CONTACT.

       b. ALWAYS wear rubber gloves when handling mineral spirits.

       c. If any chemical is splashed onto the skin, wash immediately with soap and water.

   5. Available from construction specialties

      distributor, hardware store, paint store, or

      printer's supply distributor.

F. Rags, clean soft, lint free, unsized, (such as old T-shirts or toweling)

G. Paper towels, lint free, such as Kimwipes (Fisher

   Scientific Company), or approved equal.

 

2.02 EQUIPMENT

 

A. Portable, hand-held propane torches

 

B. Hogshair brushes

 

 

PART 3---EXECUTION

 

3.01 PREPARATION

 

A. Protection:

 

   1. General: Comply with recommendations of

       manufacturers of waxes and coatings for protecting

       building surfaces against damage from exposure to

       their products.

 

   2. Protect adjacent surfaces from contact with run-off

       from hot oily waxes by covering them with liquid

       strippable masking agent or polyethylene film and

       waterproof masking tape. Apply masking agent to

       comply with manufacturer's recommendations. Do not

       apply liquid masking agent to porous surfaces.

 

   3. Rags should be used to intercept any oily wax run-

       off, so it does not come in contact with adjacent

       materials.

 

3.02 ERECTION, INSTALLATION, APPLICATION

 

A. For the wax product chosen, follow the manufacturer's product guidance in its use.

B. Heat the wax until dissolved into a liquid.

C. Add BTA, if needed according to the manufacturer's guidance, to make 3% solution (97% wax to 3% BTA).

D. Add mineral spirits to wax solution as it cools to make

   a creamy, paste wax mixture.

E. Heat the surface of the bronze evenly with the portable

   propane torches.

F. Brush the wax onto the heated surface, thoroughly coating

   the surface. Take necessary precautions to contain all

   drips with clean rags or paper towels to prevent the hot

   oily wax from coming in contact with adjacent materials.

G. Allow to cool and dry thoroughly.

H. Apply two coats of paste wax (see 05010-06-P "Applying

   Cold Microcrystalline Wax to Bronze Sculpture").

 

END OF SECTION

 

Last Reviewed 2017-03-03