Yes, you generally need to lightly sand between coats of stain to smooth out raised grain and dust nibs for a better finish, especially if you want a darker, more even color, using a very fine grit (220-320) to avoid removing the color, but you don't need to sand down to bare wood. The key is light sanding with fine-grit sandpaper or a sanding sponge to create a surface for the next coat to adhere to, followed by a tack cloth to remove dust.
Yes, always sand with the grain. The grit used between coats remains consistent. You could opt for 220 grit; just sand lightly. The first coat of stain will often raise the grain, depending on the type of wood, so sanding is primarily to smooth it down.
Yes, you can stain over stain without sanding or stripping off the old finish. But, you have to use the right products and steps to be sure that the new stain will stick to the old finish.
If you don't raise the grain at this point in the process, the stain will raise it later. However, re-sanding to get the wood smooth again removes much of the stain. Let the wood dry, then sand with 180 to 220-grit paper.
Prepare raw wood surfaces using fine grit sandpaper such as #180-#220. Use #320 for sanding in between coats. 3M sanding pads can also be used between coats. Choose your favorite application tools.
The golden rule when sanding is to always sand with the grain. Sanding along the wood grain prevents scratches, maintains surface quality, and produces a smoother finish. Sanding against the grain creates visible marks and uneven texture, which reduces the final appearance and quality.
Apply stain liberally with brush, lint-free cloth, or spray until surface is completely wet. Allow to penetrate for 5 to 15 minutes. Wipe with a soft cloth, first across the grain, then with the grain. For a darker color, re-stain when first coat is dry.
For intricate patterns or delicate floors, hand sanding may be the safer option to avoid damage. Conversely, for large, flat areas or when working with harder wood types, machine sanding is generally more effective.
Directions to get that silky smooth wood finish:
Unevenly Applying Stain
Inconsistent application pressure, overlapping areas, or working too slowly can create lap marks and an uneven appearance. This often happens when trying to cover an area that is too large at once or when not maintaining a wet edge while working.
A second coat of stain won't darken it much more unless you really rubbed it on thin the first time. I recommend putting on a second coat to ensure it's thorough.
Oil-based stains dry slowly, making them suitable for brushing or spraying over large areas. However, water-based and lacquer stains dry quickly and may leave brush marks. For these, use lint-free cloths to apply and wipe the stain, which helps avoid streaks.
1–2 coats is standard. Wait at least 4–6 hours between coats or longer if you're in a humid space. Always check the stain can for brand-specific dry times.
The new stain you are applying over the old stain should be compatible. For instance, if it's an oil-based stain, apply another oil-based stain. If it's a water-based stain, apply another water-based stain. Incompatible stains can lead to poor adhesion or blotchy and uneven finish.
The first commandment of sanding: Sand with the grain. But when you have a lot of wood to grind off, break that rule and run your belt sander diagonally across the grain (at about 45 degrees). Instead of scratching away at the wood fibers, the belt will rip them out. It's incredibly fast—and dangerous.
The three biggest culprits that ruin otherwise great projects are: Tipping the sander while it's running, which creates gouges and uneven surfaces that are difficult to repair. Applying too much pressure to the sander, which can cause burn marks, uneven material removal, and premature wear on your sandpaper.
This isn't good for your sander, sandpaper, or workpiece — and it'll tire you out quickly. Pushing too hard with random orbital sanders can even slow down the rotation of the pad. Hold the sander down with enough pressure to keep it flat, but let the sandpaper do the work.
Wet sanding is renowned for its ability to deliver a smoother finish on surfaces. The water acts as a lubricant that helps the abrasive material glide more smoothly over the surface, reducing the risk of leaving scratch marks that are often more apparent with dry sanding.
If you apply a second, unnecessary coat of stain to wood that is already adequately covered, you risk creating a tacky surface that is prone to early peeling because the second coat is not penetrating the wood surface, but simply laying on top of the first coat of stain.
If it's sticky then chances are you applied stain too thick and it may or may not cure properly. If it doesn't, then anything you top coat it with will have issues. Sand to bare wood, prime, and finish with a quality paint. For shelves, acrylic or urethane enamel are what you want.
In my opinion, yes. I believe that after 150-180 grit (on most woods), we have a case of diminishing returns. The whole idea with sanding the wood is not necessarily to get it as smooth as glass. Rather, its to give the wood a clean, even, and scratch-free appearance.
Common Mistakes to Avoid in Wood Painting
Benefits of Wet Sanding
With wet sanding, all those dust particles build up on the sandpaper instead, but they're carried away by the water/liquid you use to wet the sandpaper. This helps not only to cut down on mess but efficiently remove material from the surface to prevent further scratches.