Wet sanding vehicle paint is a method used to smooth imperfections and prepare the surface for polishing. Here's how to do it correctly:
1. Assess the Damage and Choose Sandpaper
Before you start, determine the type and severity of the imperfections you need to address. This will dictate the grit of sandpaper you need.
- High Grit (2000-3000): For removing light imperfections like orange peel, dust nibs, or minor scratches after applying clear coat.
- Medium Grit (1500-2000): For more noticeable imperfections or to blend repairs.
- Coarse Grit (1000-1500): For removing deeper scratches or imperfections (use cautiously).
2. Prepare the Car and Your Supplies
- Wash the car thoroughly: Remove all dirt and debris from the area you'll be sanding.
- Tape off surrounding areas: Protect adjacent panels and trim with automotive masking tape.
- Gather your supplies:
- Sandpaper (various grits, as needed)
- Sanding block or pad
- Spray bottle filled with clean water and a drop of car soap (acts as a lubricant)
- Clean microfiber towels
- Bucket of clean water
- Gloves (optional, but recommended)
3. Soak the Sandpaper
Submerge the sandpaper in a bucket of clean water for at least 10-15 minutes before you begin sanding. This helps soften the paper and prevents it from clogging quickly.
4. Wet Sanding the Affected Area
- Attach the sandpaper: Securely attach the soaked sandpaper to your sanding block or pad. A sanding block helps distribute pressure evenly.
- Spray the area: Generously spray the area you're sanding with your water/soap mixture. Keep the surface wet throughout the entire process.
- Sand with light pressure: Using a sanding block, move the sandpaper in straight, overlapping lines. Avoid applying too much pressure, let the sandpaper do the work. Change directions frequently (e.g., horizontal, then vertical, then diagonal) to ensure even sanding.
- Rinse frequently: Regularly rinse the area and the sandpaper with water to remove debris and prevent clogging. Inspect your progress frequently.
- Repeat with finer grits: If you started with a coarser grit, gradually work your way up to finer grits, repeating the above process each time. This will refine the finish and remove the scratches left by the coarser grits.
5. Treat the Sanded Area
- Dry the area: Thoroughly dry the sanded area with a clean microfiber towel.
- Inspect: Check for any remaining imperfections. If necessary, repeat the sanding process.
- Polish: Use a rubbing compound and polishing compound with a dual-action polisher to restore the paint's gloss and remove the sanding marks. Follow the manufacturer's instructions for the polishing compounds.
- Wax/Seal: Apply a wax or sealant to protect the paint and enhance the shine.
Important Considerations:
- Don't press too hard: Let the sandpaper do the work. Excessive pressure can create deeper scratches.
- Keep the surface wet: A wet surface is crucial for proper lubrication and prevents the sandpaper from clogging.
- Use a sanding block: A sanding block helps distribute pressure evenly and prevents you from creating uneven surfaces.
- Take your time: Wet sanding is a delicate process that requires patience.
- Test in an inconspicuous area: Before sanding a visible area, test your technique in a hidden area to get a feel for the process.
- Wear appropriate safety gear: Eye protection is recommended.
