All wood projects require preparation sanding. If you skip this critical step, your finish may fail.
See our video: How To Prep Sand New Wood
- Sand with 120-grit sandpaper followed by 150- or 220-grit sandpaper.
- Remove dust with a water-dampened rag or oil-free tack cloth.
- Let dry completely before applying GF product.
- Do not over-sand with fine-grit sandpapers; this will close and seal the wood grain, preventing ideal color absorption.
- Do NOT use steel wool with water-based finishes; the particles will get trapped in the finish and rust.
See our video: How to Prepare Existing Finishes
- Scuff clean with a Scotch-Brite™ pad or maroon synthetic steel wool & 50:50 mix of denatured alcohol & water.
- Dry 1-2 hours.
- Sand lightly with 220-320-grit foam sanding sponge.
- Remove Dust
General Finishes Enduro White Undercoat Application Steps
General Finishes White Undercoat is a spray only product that can be applied over raw wood MDF, existing finishes and as an undercoat for White Poly and light-colored paints. It acts as a physical barrier rather than a chemical barrier. For woods that exhibit tannin bleed-through, we recommend General Finishes Stain Blocker.
- Watch product overview video here.
- Work in a well-ventilated area.
- Stir General Finishes Enduro White Undercoat thoroughly to reincorporate solids that have settled to the bottom of the can before and throughout the application process.
- Test for adhesion over existing sealed surfaces.
- Thin as desired with distilled water; start with 5%, adding up to 10% by volume.
- Increase open time, if needed, with 10-15% by volume of General Finishes Extender, if allowed by local regulations. GF Extender will improve flow and leveling and increase open time, which is helpful in dry climates.
- Ready to spray from the container. Apply 1-2 coats, depending on the substrate, the amount applied, and the application method. If you apply 1 light coat you can sand through, add another coat. If you apply 1 solid first coat and sand lightly, then you only need one.
Spray application: Before spraying, strain through a medium-mesh filter. Spray wet films at 3-5-mil thickness. Medium air cap. Fluid tip sizes: Compressed air: .040, HVLP: .072 or Airless: .011-.013. medium air cap. Verify tip sizes with your equipment supplier. See our spray tip size recommendations here. Keep your gun at a 90° angle, 6-8" from the surface. On large, flat areas, use wet, even patterns 6-8" wide. For narrow surfaces, reduce the fan pattern to 2-3" wide to reduce overspray. Overlap each pass 25% to conceal lines. Wear a full filter (NIOSH/MSHA approved) respiratory & eye protection and work in a ventilated space. Read here for more information on spraying techniques.
Face frames on cabinets: Enduro professional products are engineered to be spray-only but can be applied successfully to cabinet face frames, edges or drawer fronts with a brush, staining pad or small cabinet specific 3/8" nap microfiber roller such as Whizz or AllPro brand. Larger areas may not level with hand application.
- If a faster build is desired over raw wood, use General Finishes Sanding Sealer for the first coat.
- Dry time based on ideal conditions: 70°F/20°C; 50-70% humidity. Tack-free: 5-10 minutes. Ready to sand: 30-45 minutes. Re-coat: 1 hours. Inadequate dry time is one of the top reasons for product failure. You can tell if a water-based finish is dry if it forms a powder when lightly sanded with a fine-grade (220-320) foam sanding pad. If in doubt, wait longer. Increase dry time if: a. Humidity is over 80%; b. 3+ coats are applied; c. Thick coats are applied; d. Applying over an existing sealed finish; e. Layering General Finishes water- and oil-based products: Water over oil: Let oil-based products dry 72+hr before applying water-based products. Oil over water: Let water-based products dry 24+hr before applying oil-based products
- To accelerate dry time in humid conditions, add General Finishes Accelerator and work in a space with good ventilation and air movement. If you decide to re-coat before the recommended time, test dryness.
- Finish sand between coats with a fine-grade (220-320) foam sanding pad to improve smoothness and adhesion.
- Remove dust with a vacuum, compressed air, an oil-free tack cloth or a water-dampened rag.
Warning: Do not use water-based products with Linseed Oils or Danish Oils.