Technical Procedures Disclaimer
Prior to inclusion in GSA’s library of procedures, documents are reviewed by one or more qualified preservation specialists for general consistency with the Secretary of Interior Standards for rehabilitating historic buildings as understood at the time the procedure is added to the library. All specifications require project-specific editing and professional judgement regarding the applicability of a procedure to a particular building, project or location. References to products and suppliers are to serve as a general guideline and do not constitute a federal endorsement or determination that a product or method is the best or most current alternative, remains available, or is compliant with current environmental regulations and safety standards. The library of procedures is intended to serve as a resource, not a substitute, for specification development by a qualified preservation professional.
We’ve reviewed these procedures for general consistency with federal standards for rehabilitating historic buildings and provide them only as a reference. Specifications should only be applied under the guidance of a qualified preservation professional who can assess the applicability of a procedure to a particular building, project or location. References to products and suppliers serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or method is the best alternative or compliant with current environmental regulations and safety standards.
- This procedure includes guidance on staining and lacquering damaged areas of previously stained and lacquered woodwork.
- See 01100-07-S for general project guidelines to be reviewed along with this procedure. These guidelines cover the following sections:
- Safety Precautions
- Historic Structures Precautions
- Quality Assurance
- Delivery, Storage and Handling
- Project/Site Conditions
- Sequencing and Scheduling
- 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).
- Mohawk Finishing Products, Inc. Route 30 N. Amsterdam, NY 12010
- Wood Filler: Paste wood filler shall be blended silica in aromatic mineral spirits solvent with an alkyd resin base, color as required to match original stain (Mohawk Finishing Products, Inc.), or approved equal.
NOTE: USE OF WOOD FILLER WITH LINSEED OIL VEHICLE MAY CAUSE WHITE SPOTS IN LACQUER FINISH COAT OR INHIBIT ITS PROPER DRYING.
- Sanding Sealer: Lacquer based sanding sealer, formulated for brushing, composed of the following products (Mohawk Finishing Products), or approved equal.
Note: Amounts of products listed below make one (1) gallon of sanding sealer. The ratio of constituents shall remain constant if a greater quantity is required. Product Amount #610-160 High solids sanding sealer 50 oz. #650-010 Lacquer thinner 12 oz. #502-000 Solar lux retarder 2 oz.
- Wood stain: Solvent (aromatic) reducible, pigmented wiping surface stain with an alkyd binder, color matched to original stain, such as (Mohawk Finishing Products, Inc.), or approved equal.
- Tack Rags
- Steel wool: Grade 0000
- Cloths: Soft, clean and lint free
- Vegetable Oil Soap: Potassium soap of vegetable oil containing no acids, abrasives, caustics or solvents, such as "Murphy's Oil Soap" (Murphy-Phoenix Company), OR approved equal.
NOTE: NON-IONIC DETERGENTS ARE NOT RECOMMENDED; THEY ARE TOO HARSH.
- Soft, Natural Bristle Brush
- Surface Preparation:
- Lightly sand abraded veneer of windows and areas damaged by chairs.
- Make sure that all wood surfaces are clean and smooth.
- Fill all gouges and scratches with compatible surface putty color matched to stain. Sand smooth.
3.02 ERECTION, INSTALLATION, APPLICATION
- Staining Procedures:
- Color mix stain to match original.
- Apply stain to all bare wood surfaces with a stiff flat bristle brush.
- Allow stain to set as required for proper color match as determined by testing process.
- Wipe off excess stain by rubbing parallel to the grain with a soft, dry cloth.
- Apply one (1) coat of sanding sealer rub with 0000 steel wool and wipe with a tack rag. (May not be required, test during preparation of sample areas.)
- Finish Coating:
- Make sure that surface is clean, level and free of defects.
- Rub with 0000 steel wool and wipe with a tack rag.
- Apply a minimum of three finish coats. Brush on lacquer using a wide, moderately full brush to flow a continuous, wet coat onto the surface with minimum of retrace or back brushing - preferably none. Work area small enough so that by working with long, fast, continuous strokes, each succeeding stroke works against the wet edge of the last stroke. A dry tack rag moving ahead of the brush will help to keep the surface dust free.
- Allow each coat to dry at least two, preferably four hours.
- Sand with 4/0 to 6/0 paper, only if necessary to remove defects and level surface for next coat.
- Before adding the next coat, vacuum and wipe the surface with a dry tack rag in order to remove all grit and dust.