Oil-Based Sanding Sealer

Old Masters Interior Oil-Based Sanding Sealer is designed to seal and protect wood surfaces and can be used to prepare surfaces for the application of a clear topcoat finish.

Technical Data Sheet

Where to Use

Old Masters Interior Oil-Based Sanding Sealer is recommended for use on interior wood surfaces as a sandable basecoat or sealer prior to the application of a clear topcoat finish. It may be applied to all types of bare or stained woods.

Surface Preparation

All surfaces must be clean, dry, and free from dirt, wax, or grease.

New Wood: Sand the wood thoroughly with medium grit sandpaper and progress to fine grit sandpaper; this will help to create a smoother finish. Always sand in the direction of the wood grain. Sand smooth and remove dust with a rag dampened with mineral spirits.

Previously Finished Surfaces: Restore previously finished surfaces to bare wood by removing old finishes with a paint or varnish remover or by sanding. When applying over stained wood, ensure stain is thoroughly dry. Remove all dust prior to application.

WARNING! If you scrape, sand or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or log on to www.epa.gov/lead.


Stir thoroughly before and during application. DO NOT SHAKE. Sanding Sealer can be applied with a pure bristle or polyester brush, or sprayed.

  • Apply sealer liberally with the grain, then level with light, even strokes. Avoid excessive brushing. One coat thoroughly seals and prepares the surface for succeeding coats of clear finish.
  • Allow surface to dry approximately 2 to 3 hours. Surface can be sanded after 3 hours depending on temperature and humidity.
  • Ensure surface is thoroughly dry before sanding. Smooth sealer by sanding with fine sandpaper. Be careful when sanding not to sand through the sealer film and remove the stain color.
  • Remove any sanding dust using a tack rag, then wipe the surface with a cloth moistened with mineral spirits. Topcoat with varnish or polyurethane clear finish.

Do not thin. Use as packaged.

Approximately 300 to 450 square feet per gallon depending on the type and porosity of the wood.

Drying Time
Apply when air and surface temperatures are between 60° and 90°F and humidity is between 30% and 70%. Interior Oil-Based Sanding Sealer will dry to touch in 2 to 3 hours and can be sanded after 3 hours or when sanding sealer is thoroughly dry.

Using a cleaning solvent, such as paint thinner or mineral spirits, is recommended for cleanup. The use of paint thinners or mineral spirits may violate VOC compliancy in your area. Check with your local government agencies to ensure proper compliancy.

DANGER: Rags, steel wool, sanding residue, and other wastes used or soaked with this product may spontaneously catch fire if improperly discarded. No ignition source is required for these wastes to start on fire by themselves. Immediately place rags, steel wool, sanding residue, and other wastes used or soaked with this product in a sealed, water-filled metal container. Dispose of in accordance with local fire regulations.

MAX VOC: 550 grams/liter (4.6 lbs/gal)

Surface Preparation

Proper surface preparation is the most important step of any stain or finish project. Follow these easy steps to attain a professional-looking finish every time.

Filling Woodgrain

Some open-pore wood species or woods with large imperfections may require an additional step to prepare the surface for staining and finishing. Creating a smooth finish on these woods can be obtained by using Old Masters Woodgrain Filler. Use on hardwoods, such as oak, ash, and mahogany. Use as directed.

Wood Conditioning

Some woods, such as pine, fir, maple, and poplar absorb stain unevenly creating a blotchy appearance. Old Masters Wood Conditioner is a clear wood sealer which enables uniform stain application under oil- or water-based stains. Stain must be applied over Wood Conditioner within 2 hours. Ideal for use on soft woods which are being stained with or adjacent to hardwoods.

Sanding Sealer

Use a sand-able basecoat or sealer prior to the application of varnishes or polyurethanes. Old Masters Oil-Based and Water-Based Sanding Sealers may be applied to all types of bare or stained woods. These products help to promote a smooth, fine finish.

Product Number Color Size Safety Data Sheets
45001 Clear Gallon EnglishSpanish
45004 Clear Quart EnglishSpanish