![Wood Putty or Wood Filler: What’s the Real Difference? [2025 Guide]](https://tpook.com/wp-content/uploads/2025/04/Wood-Putty-or-Wood-Filler-Whats-the-Real-Difference-2025-Guide.png)
Wood Putty or Wood Filler: What’s Stop Making the Wrong Choice!
When it comes to fixing wood surfaces, many people get confused between wood putty and wood filler. Although they may seem similar, these two products serve different purposes. Choosing the wrong one can mess up your woodworking project or furniture restoration. In this guide, we’ll break it down clearly so you’ll never make the wrong choice again.
🪵 What Is Wood Filler?
Wood filler is a compound made from wood fibers and a binder (water-based or solvent-based). It’s used to repair surface imperfections in unfinished wood. Once dry, it becomes hard and can be sanded, stained, or painted just like real wood.
✅ Top Uses of Wood Filler:
- Filling dents, cracks, and nail holes in raw wood
- Prepping wood surfaces before staining or painting
- Repairing chipped corners or joints in wood furniture
- Filling gaps in hardwood flooring or trim work
🛠️ Best For:
- Indoor wood projects
- Raw or unfinished wood
- Stain and paint prep
🔥 Pro Tip:
Always apply wood filler in thin layers for best results, and sand between applications if needed.
🧴 What Is Wood Putty?
Wood putty, often called “plastic wood,” is typically oil-based and made from synthetic materials. It’s designed for finished or stained wood and remains slightly flexible even after it dries—making it excellent for outdoor or moisture-prone areas.
✅ Top Uses of Wood Putty:
- Filling minor holes or cracks in stained or varnished wood
- Concealing nail holes in crown molding or baseboards
- Touch-ups on cabinetry or wood paneling
🛠️ Best For:
- Finished or stained wood surfaces
- Outdoor wood projects
- Water-resistant touch-ups
⚠️ Note:
Most wood putties aren’t sandable or stainable—so pick a color that closely matches your wood finish.
⚔️ Wood Putty vs. Wood Filler – Key Differences
| Feature | Wood Filler | Wood Putty |
|---|---|---|
| Base Material | Wood fibers + binder | Synthetic resin or oil-based compounds |
| Drying Behavior | Hardens completely | Remains flexible |
| Sandable | Yes | No |
| Paintable/Stainable | Yes | Mostly no |
| Usage Timing | Before finishing | After finishing |
| Ideal For | Indoor, unfinished wood | Outdoor, finished wood |
| Water Resistance | Limited (unless waterproof version) | High |
🧰 How to Apply Wood Putty (Step-by-Step)
- Clean the surface – Remove dust, dirt, or any finish oils.
- Color match – Pick a putty that closely matches your wood’s finish.
- Apply with knife or finger – Push the putty into the hole or crack.
- Smooth it out – Wipe away the excess with a cloth or scraper.
- Let it dry – Drying time varies, but most dry within 2–6 hours.
- Optional: Apply finish – If needed, apply a matching touch-up pen or topcoat.
🧪 How to Apply Wood Filler (Step-by-Step)
- Prepare the area – Sand lightly and remove dust.
- Mix if needed – Some fillers need to be stirred before use.
- Apply with putty knife – Fill the gap with a generous amount.
- Smooth the surface – Press firmly and level the surface.
- Let it dry – Allow 15 minutes to several hours depending on the product.
- Sand and finish – Sand it smooth and then paint or stain.
🏆 Top Wood Filler Products in 2025
Here are some editor-recommended products that DIYers and pros trust:
- Minwax High Performance Wood Filler – Strong and durable, great for big repairs.
- Bondo Wood Filler – Fast-drying, indoor/outdoor use, ideal for DIYers.
- Ronseal High Performance Wood Filler (UK/AU) – Waterproof, easy to shape and sand.
Available at Home Depot, Lowe’s, Amazon, or Bunnings (AU/NZ).
❓ FAQ – Wood Putty vs Wood Filler
1. What is the main difference between wood putty and wood filler?
Answer:
The primary difference lies in their composition and purpose. Wood filler is usually made of wood fibers and a binder, making it ideal for unfinished wood that will be sanded and stained. It dries hard and is sandable. Wood putty, however, is made from oil-based or synthetic materials, designed for filling small imperfections on finished surfaces like stained or varnished wood. It stays slightly flexible and is not sandable, making it better for outdoor use or minor touch-ups.
2. Can wood filler be used on finished wood?
Answer:
Technically yes, but it’s not recommended. Wood filler is best applied to raw or unfinished surfaces because it’s meant to be sanded and finished afterward. If used on finished wood, it might not blend properly, and sanding it can damage the surrounding finish. For finished wood, wood putty is the better choice as it blends with stains and finishes more naturally.
3. Can I use wood putty on stained wood?
Answer:
Yes, wood putty is specially designed for stained or varnished wood. It comes in different colors to match common wood tones, making it ideal for hiding nail holes or minor scratches on finished surfaces. While most wood putties aren’t stainable, many manufacturers offer pre-colored putties that can match your stain quite closely.
4. Can wood filler be stained or painted?
Answer:
Yes, wood filler can be both stained and painted, making it highly versatile for projects that require a uniform finish. However, for the best result:
- Let it dry completely.
- Sand it smooth.
- Use a wood conditioner or pre-stain product to ensure even stain absorption, as filler may absorb stain differently than the surrounding wood.
5. Is wood putty waterproof?
Answer:
Most wood putties are water-resistant but not entirely waterproof. They contain oil-based compounds that make them suitable for outdoor applications or humid environments. That said, for long-term water exposure (like boat decks or constantly wet surfaces), using a marine-grade filler or sealant is more reliable.
6. Can I screw or drill into wood filler?
Answer:
You can drill or screw into wood filler once it’s fully hardened, but it doesn’t hold screws as well as natural wood. It’s best used for cosmetic repairs, not structural support. For screw-holding strength, consider using epoxy wood filler or reinforcing the area with a wood plug before inserting screws.
7. Does wood filler expand or contract with temperature changes?
Answer:
Yes, but only slightly. Traditional wood fillers are rigid and may crack or pop out if the surrounding wood expands or contracts drastically due to temperature or humidity changes. That’s why they’re not ideal for outdoor use. Wood putty, on the other hand, stays flexible and adapts better to environmental changes.
8. How long does wood filler take to dry?
Answer:
Dry time depends on the brand and thickness of application, but most wood fillers dry within 15 minutes to 8 hours. For deep holes or large repairs, drying may take longer. Always refer to the manufacturer’s label, and for best results, allow at least 24 hours before sanding or staining.
9. Is wood putty sandable like wood filler?
Answer:
No, wood putty is not meant to be sanded. Since it stays somewhat pliable and oily, sanding can smear it or gum up sandpaper. Use putty only after the surface is finished and apply it carefully using a putty knife or finger, then smooth out the excess gently.
10. Can I use wood putty to fill large holes or gaps?
Answer:
Not recommended. Wood putty is ideal for small holes, cracks, and cosmetic defects. For anything deeper or wider, use a wood filler or even a two-part epoxy filler for structural integrity. Putty is not strong enough to support large repairs.
11. Does wood filler shrink when it dries?
Answer:
Yes, some wood fillers do shrink slightly upon drying, especially water-based varieties. For best results:
- Slightly overfill the repair area
- Let it dry completely
- Sand it flush with the surface
For less shrinkage, choose a high-performance or two-part filler.
12. Can wood putty be used on outdoor decks?
Answer:
Yes, wood putty is a good option for outdoor use because it’s water-resistant and flexible. However, ensure that the specific brand you choose is rated for exterior use. It works best for filling nail holes and minor surface blemishes, not deep structural damage.
13. What type of wood filler is best for exterior use?
Answer:
For outdoor projects, use a two-part epoxy wood filler or high-performance weather-resistant filler like:
- Minwax High Performance Wood Filler
- Bondo Wood Filler These offer durability, water resistance, and excellent adhesion.
14. How do I color match wood putty with my furniture?
Answer:
Most wood putties come in pre-mixed shades like oak, mahogany, walnut, and cherry. To match:
- Test a small sample before applying it widely
- Consider mixing two colors to get a better match
- Apply a touch of stain or marker to adjust the tone if needed
15. Can I paint over wood putty?
Answer:
Yes, but results can vary. Wood putty isn’t always paint-friendly due to its oil base. Use paintable wood putty or opt for wood filler if painting is the end goal. Always prime first for better paint adhesion.
16. Can I use wood filler or putty on MDF or plywood?
Answer:
Yes. Wood filler works well on MDF and plywood, especially for smoothing edges or hiding seams before painting. Just ensure the filler is compatible with engineered wood. Avoid water-based fillers on MDF as they may cause swelling. Use solvent-based or epoxy fillers for better results.
17. Is there a difference between plastic wood and wood putty?
Answer:
“Plastic wood” is often another name for wood putty, though it sometimes refers to wood filler made with plastic resins. Check the label – if it’s sandable and paintable, it’s likely a filler. If it’s oil-based and flexible, it’s a putty.
18. How do I repair a rotted wood section?
Answer:
For rotted wood:
- Remove all the rot using a chisel or utility knife.
- Apply a wood hardener to strengthen remaining wood.
- Use a two-part epoxy filler for rebuilding the area.
- Sand, prime, and paint after it’s cured.
Wood putty won’t work here – it’s not designed for structural repairs.
19. Why is my wood filler cracking after drying?
Answer:
Cracking occurs due to:
- Over-shrinking (cheap or water-based filler)
- Too much filler in one go
- Movement of the underlying wood Apply in thin layers, let each dry fully, and avoid using filler in high-flex areas.
20. Can I use both wood filler and wood putty on the same project?
Answer:
Absolutely! Use wood filler first on raw wood to repair major holes or cracks, then sand and stain. After applying finish or paint, use wood putty to fill any leftover nail holes or minor surface imperfections. This ensures a flawless finish.
📝 Conclusion: Wood Putty or Filler – Which One to Choose?
Still confused? Here’s a quick rule:
- 👉 Use wood filler for unfinished wood before painting or staining.
- 👉 Use wood putty for finished or outdoor wood where flexibility and water resistance are key.
Whether you’re patching a table, fixing trim, or restoring vintage wood, the right product makes all the difference. Bookmark this guide so you never second-guess your choice again!