You use fine grit sandpaper, typically 320 grit, to sand canvas after priming.
Preparing Your Canvas for Painting
Sanding is a crucial step in preparing a canvas for painting. It helps create a smooth surface for better paint adhesion and a more professional-looking finish. Here's a closer look at the process, incorporating the information from the provided reference:
The Priming Process
- Gesso Mixture: Begin by mixing gesso, a bit of water, and a liquid acrylic to create a toned base.
- Application: Apply this mixture to the canvas using a foam brush. This process is important for ensuring that the surface is receptive to the paint and the painting looks even in the end.
- Sanding: Once the gesso layer is dry, sand the canvas down.
Why Use Fine Grit Sandpaper?
Using a fine grit sandpaper like 320 grit is essential for several reasons:
- Smooth Surface: Fine grit sandpaper ensures a smooth surface without creating deep scratches or grooves in the gesso.
- Enhanced Paint Adhesion: A smooth, slightly abraded surface allows paint to adhere better, preventing peeling or flaking.
- Even Texture: Sanding helps create an even texture across the canvas, which is especially important when applying multiple layers of paint.
Table of Sandpaper Types for Canvas
| Sandpaper Grit | Application |
|---|---|
| Coarse (e.g., 80-120) | Not recommended for canvas. |
| Medium (e.g., 150-220) | May be used in certain cases but carefully. |
| Fine (e.g., 320) | Ideal for sanding gesso on canvas. |
| Very Fine (e.g., 400+) | Not usually needed but can be used lightly after 320 if needed. |
Practical Insights and Tips
- Gentle Pressure: When sanding, apply gentle, even pressure. Avoid pressing too hard, as this may damage the gesso layer.
- Circular Motions: Use light circular motions to sand the entire surface evenly.
- Dust Removal: After sanding, wipe away any dust with a clean cloth or tack cloth before painting.
- Multiple Layers: For thicker gesso layers, you may need to repeat the sanding process after each layer has dried.
By using a fine grit sandpaper, you can achieve a perfectly prepared canvas, ready to receive your masterpiece.
