What's the best grit to start with for removing old, flaky paint?

For removing old paint or varnish, you need an aggressive approach. Start with a coarse grit, typically 60 or 80-grit sandpaper, to cut through the old finish and expose the bare wood. Be sure to progress through the grits afterwards (120, 180) to smooth out the scratches left by the coarse paper.

Can I use an orbital sander for everything?

A random orbital sander is incredibly versatile and is the go-to for most flat surfaces. However, for tight corners, intricate details, or sharp edges, it can be too aggressive or clumsy. For these areas, hand sanding with a sanding block or a detail sander is a better choice for precise control.

How do I know when I'm finished sanding with a particular grit?

Look at the surface in a low, raking light. You should see a uniform scratch pattern from your current grit. If you can still see deeper scratches from the previous, coarser grit, you need to keep sanding. Once only the scratches from your current grit remain, you're ready to move to the next finer grit.

Why does my wood look blotchy after staining, even though I sanded it?

Blotchiness is usually caused by inconsistent sanding or not cleaning properly between grits. If you miss spots or don't remove the scratches from a previous grit, those areas will absorb the stain differently. Wiping the wood with mineral spirits before staining can help you spot these inconsistencies.

Is it necessary to sand between coats of polyurethane or varnish?

Yes, it is highly recommended. Applying a finish can raise tiny wood fibres and trap dust nibs, creating a slightly rough surface. A very light sanding with a fine grit (320 or 400) between coats will knock these down, resulting in a much smoother, more professional final finish.

The job feels too big or I need a perfect finish. Can you help?

Absolutely. For large-scale projects like deck restorations, floor refinishing, or preparing architectural timber where the finish is critical, our professional team has the tools and experience to deliver a flawless result. If you want to ensure a perfect foundation for your project, give Michael a call .

Sand Wood Like a Pro: A Carpenter's Guide (2026)

Updated 27 April 2026Tools & Techniques5 min read1,048 words

The Unseen Foundation: Why Proper Sanding is Non-Negotiable

Before a single drop of paint or stain touches your timber, the quality of your finish has already been largely determined. Proper sanding is the foundation for everything that follows. Its role extends far beyond simply smoothing the surface; it is a crucial remediation and preparation step that directly impacts both aesthetics and durability.

Detail

Preparing for a Flawless Finish

Sanding opens up the pores of the wood, creating a uniform surface that is ready to accept a finish. Without this step, stains can appear blotchy and uneven, as different parts of the wood absorb it at different rates. For protective coatings like polyurethane or oils, an unsanded or poorly sanded surface can lead to poor adhesion, causing the finish to peel or wear away prematurely—a costly failure in our coastal, salt-air environment. For independent advice, refer to Worksafe Queensland.

Detail

Correcting Imperfections

Timber is rarely perfect straight from the supplier. It often has milling marks, scratches, small dents, or water stains. Effective sanding is your opportunity to correct these flaws. By methodically working through the grits, you remove a very fine layer of the wood, erasing imperfections and creating an immaculate surface. This same principle applies to restoration work, whether you're tackling deck repair and restoration or fixing localised termite damage before treatment. Additional Australian resources are available via Safe Work Australia.

Choosing the Right Sandpaper to Sand Wood Like a Pro

Walking into a hardware store can present you with a bewildering array of sandpaper choices. Understanding the basics of grit and material type is essential to sand wood like a pro. The number on the back of the sandpaper is its "grit," which refers to the coarseness of the abrasive particles. The lower the number, the coarser the grit; the higher the number, the finer. See also ForestLearning for related standards and guidance.

Coarse Grits (40–80): Used for rapid material removal. Ideal for stripping old paint or varnish, or for shaping and levelling rough, raw timber.
Medium Grits (100–150): The workhorse of general sanding. This range is perfect for smoothing the surface after using a coarse grit and for most initial sanding on new, relatively clean wood.
Fine Grits (180–240): Used for final smoothing before applying a finish. Sanding to this level creates a silky-smooth surface and is critical for a high-quality look and feel.
Very Fine Grits (320+): Typically reserved for sanding between coats of finish to "de-nib" (remove tiny dust particles) and ensure maximum smoothness.

The Pro-Sanding Process: A Step-by-Step Guide

A systematic approach is key to achieving a professional finish. Rushing the process or skipping steps will always show in the final result. Follow these steps for a perfect surface every time.

01Select Your Starting Grit: For rough wood or stripping finishes, start coarse (e.g., 80-grit). For new, clean wood, you can often start with 120 or 150-grit.
02Always Sand With the Grain: Sanding parallel to the wood grain prevents unsightly cross-grain scratches that become glaringly obvious once a finish is applied. On very large panels, you can work diagonally with the initial coarse grit to flatten the surface, but always finish each grit sanding with the grain.
03Use the Right Tool: For large, flat surfaces, a random orbital sander is efficient and user-friendly. For edges and details, hand sanding with a block provides more control. Learning which carpentry tools to use for which job is half the battle.
04Apply Even, Consistent Pressure: Let the sander and the sandpaper do the work. Pressing down too hard can create divots, swirl marks, and an uneven surface. Keep the sander moving at a slow, steady pace.
05Clean Between Grits: This is a critical, often-skipped step. After sanding with one grit, vacuum all the dust from the surface and wipe it down with a tack cloth or a rag dampened with mineral spirits. If you don't, the coarser abrasive particles will get trapped under your finer sandpaper and create deep scratches.
06Check Your Work: After your final grit, wipe the surface with mineral spirits. This will temporarily mimic the effect of a finish, revealing any swirl marks or scratches you may have missed. It's your last chance to fix them before committing to your wood finishing.

Common Sanding Mistakes and How to Avoid Them

Even seasoned DIYers can fall into bad habits. Being mindful of these common pitfalls will save you from frustration and ensure your projects, from a simple picture frame to a complete set of custom timber stairs, look their best.

Skipping Grits: It’s tempting to jump from 80-grit straight to 220-grit, but this is a mistake. Each successive grit is designed to remove the scratches left by the previous one. A big jump will leave deeper scratches behind, resulting in a poor finish.
Sanding Against the Grain: This creates fine scratches that rupture the wood fibres, which will soak up more stain and look much darker than the surrounding wood.
Pressing Too Hard: Overloading the sander creates heat, clogs the sandpaper, and can leave ugly swirl marks or gouges. A light touch is all that's needed.
Not Sanding End Grain Enough: End grain is like a bundle of straws—it absorbs finishes much more readily than face grain. To prevent it from looking almost black after staining, you need to sand it to a finer grit (e.g., one step higher than the rest of the project) to burnish the surface and slow absorption.
Forgetting to Hand Sand Corners: Power sanders can't get perfectly into sharp corners. Always finish with a quick hand sanding to ensure every part of your project is prepared equally.

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