General Finishes White Undercoat Water Based Primer

General Finishes White Water Based Undercoat/Primer is similar to General Finishes Sanding Sealer with the addition of white colorant to provide a primer undercoat for white/off-white wood finishes. The high solids facilitate a fast film build and sand easily. Use as a basecoat for pigmented acrylic finishes. This white undercoat dries tack-free in 10-20 minutes. Particularly effective on MDF. Please click the below headers to reveal the instructional info for this product. Step 1: Preparation for White Undercoat All wood projects require preparation sanding, and all existing finishes require prep cleaning and sanding. If you skip this critical step, your finish may fail. Preparation for Raw Wood Sanding Schedule: 120-grit 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 abs