Millwork / Furniture - Nitrocellulose Lacquer Systems - HS Sanding Sealer

  • Product Description
  • Physical Properties
  • Application Data
  • Directions for Use
  • Technical Literature

Product Code:


Product Description and Uses:

Schwartz HS Sanding Sealer is a high solids nitrocellulose-based sanding sealer for any interior wood furniture and cabinetry.

Especially formulated with sanding aid making it easy to sand.

It has an excellent adhesion and film build providing an excellent base for Schwartz nitrocellulose-based topcoats.

Use with NC lacquer, pre-cat and post-cat lacquer topcoats.

Product Advantages:

  1. Fast dry.
  2. Excellent build and adhesion.
  3. Seals any wood surface.
  4. High solids 5. Sands easily.

Standard Container Sizes

205L Drum

18.9 Litre Pail

Physical Properties:


55 - 59 sec #4 Ford Cup

Flash Point:


Weight Solids:

23 to 25%


0.925 g/ml




cloudy liquid

Shelf Life:

2 years unopened

Environmental Information:

VOC: max 736 g/L

Suggested Uses:

Used to seal interior wood furniture and millwork.

Excellent base for Schwartz NC lacquers.

Mixing Instructions:

Mix before use.

Reduce with 30% 4T100 Lacquer Thinner to adjust spray viscosity.

Recommended System:

Use Schwartz 1C189 HS Sanding Sealer followed by Schwartz NC lacquer topcoats.

Application Tools:

Apply using conventional, airless, air-assisted airless and HVLP sprayer/atomizer.


300 - 350 sq ft/gal (1 mil dry film)

Dry Time:

Tack free in15 minutes (25C, 60% RH).

Dry Hard in 30 mins (25C, 60% RH).

CAUTION: cold temperature, high humidity, or lack of airflow will prolong dry times.

Recoat time:


Clean-up Solvent:

4T100 Lacquer Thinner


4T100 Lacquer Thinner


4T175 Retarder

Pot Life:


Surface Preparation:

Surfaces must be clean, dry and contaminant-free.

Sand wood with 150-grit sandpaper before staining or coating.

Remove all dust.

When sealer or topcoat is sanded, always apply succeeding coat within 8 hours of sanding.

Sand between coats with 280-320 grit sandpaper.


Following surface preparation; apply 1C189 HS Sanding Sealer by spray.

Check with equipment manufacturer for settings to achieve the correct atomization.

Follow with 2 even coats of Schwartz NC-base lacquer topcoats at 3-5 mils wet film thickness per coat.

Always allow to dry and scuff sand between coats with 280-320 grit sandpaper.

Film build of entire system must not exceed 5 mils dry film thickness.

Ambient Conditions:

Use only when ambient conditions are 18°C to 30°C and RH= 40-60%.

Wood moisture content must be between 6 - 10%


Store indoor at room temperature, away from heat, ignition sources, open flames and direct sunlight.


Use in a well-ventilated area.

Avoid sparking, use non-sparking tools.

Avoid open flames, turn off all pilot lights, ensure that work area is properly ventilated.

Soiled rags and waste products may contain combustible liquids or vapours, dispose in accordance with local regulations.

Refer to MSDS for information on safe use of this product.

Material Safety and Technical Data Sheets for download.

Please click the appropriate link below.

Technical Data Sheets (TDS)

TDS - 1C189 - Nitrocellulose HS Sanding Sealer (pdf)

Material Safety Data Sheets (MSDS)

MSDS - 1C189 - Nitrocellulose HS Sanding Sealer (pdf)