TWP 100 and TWP 1500 are two of the most popular penetrating deck stains from TWP. Both are oil-based, semi-transparent stains designed to protect exterior wood from moisture, UV exposure and weathering.
So, which is better: TWP 100 or TWP 1500?
For most homeowners, TWP 1500 is the easier choice because it is a lower-VOC formula and is available in all 50 U.S. states. TWP 100 has a higher VOC level and is restricted in certain states, but the manufacturer says it penetrates better and dries faster.
In independent two-year testing, both products performed very similarly overall.
This comparison looks at the differences in formula, VOC levels, penetration, colors, coverage, application, durability, maintenance, price and real-world performance.
Review basis: This is a research-based comparison. We have not personally tested TWP 100 or TWP 1500. Information was checked against current manufacturer documentation and independent testing.
TWP 100 vs 1500: Quick Answer
Choose TWP 100 if it is legally available in your state and you want the original higher-VOC formula with faster absorption and slightly deeper penetration. Choose TWP 1500 if you live in a VOC-restricted state or simply prefer the lower-VOC formula.
For most decks, the difference in real-world performance is relatively small.
The most important difference is VOC compliance, not a dramatic difference in protection.
TWP 100 vs TWP 1500 Comparison
| Feature | TWP 100 | TWP 1500 |
| Formula | Oil-based | Oil-based |
| Finish | Semi-transparent | Semi-transparent |
| VOC level | 550 VOC | 350 VOC |
| State availability | Restricted in some states | All 50 states |
| Penetration | Slightly deeper | Very good |
| Absorption | Faster | Slightly slower |
| Drying | Faster | Generally slower |
| UV protection | Excellent | Excellent, with higher UV protection according to TWP |
| Application | 1–2 coats wet-on-wet | 1–2 coats wet-on-wet |
| Best for | States where 100 is permitted | Broadest availability |
| Maintenance | Similar | Similar |
| Typical deck longevity | About 2–3 years | About 2–3 years |
The exact result will depend on the wood species, age, preparation, climate and application.
What Is TWP 100?
TWP 100 is the original higher-VOC TWP formula.
It is an oil-based, semi-transparent penetrating wood preservative designed for exterior wood surfaces.
The manufacturer says it:
- Penetrates deeply into wood
- Repels water
- Helps protect against UV damage
- Helps retain wood color
- Resists mold and mildew
- Enhances the natural grain
- Helps protect exterior wood from weathering
TWP 100 is commonly considered for cedar, redwood and pressure-treated pine decks.
If you are still deciding which decking species to use, see our guide to the best woods for decks.
What Is TWP 1500?
TWP 1500 is the lower-VOC formula.
It is also an oil-based, semi-transparent penetrating stain.
The manufacturer developed the 1500 Series to meet stricter VOC requirements while continuing to provide protection for exterior wood.
TWP says the 1500 Series offers:
- Low-VOC formulation
- Water resistance
- UV protection
- Mold and mildew resistance
- Protection against cracking and splitting
- A natural semi-transparent appearance
- Broad state availability
For homeowners who cannot legally purchase TWP 100, TWP 1500 is the main alternative within the TWP range.
The Biggest Difference: VOC Levels
This is the most important difference between the two products.
TWP 100
TWP 100 is listed at 550 VOC.
Because of its higher VOC level, it cannot be sold or used in certain states and regions.
TWP 1500
TWP 1500 is listed at 350 VOC.
It is compliant across all 50 U.S. states according to TWP.
That makes TWP 1500 the more widely available option.
If you live in an area with strict VOC regulations, there is no real choice between the two. You need a compliant product.
Always check current local regulations before purchasing.
Does TWP 100 Penetrate Better Than TWP 1500?
According to TWP, yes.
The manufacturer says TWP 100 has a faster absorption rate and penetrates better than the 1500 Series.
This is one reason the 100 Series can be attractive when it is legally available.
However, the difference should not be exaggerated.
Independent testing from DeckStainHelp found that both formulas performed very similarly over two years.
So while TWP 100 may have an advantage in penetration, that does not automatically mean your deck will last dramatically longer with TWP 100.
Wood condition and preparation are still extremely important.
Which Dries Faster: TWP 100 or 1500?
TWP 100 generally dries faster.
The manufacturer says the 100 Series has a faster absorption rate and dries faster than the 1500 Series.
TWP 1500 typically takes longer because of its lower-VOC formulation.
However, actual drying time depends on:
- Temperature
- Humidity
- Wood moisture
- Sun exposure
- Air movement
- Amount of stain applied
- Wood species
- Surface preparation
Never rely on a fixed drying time for every project.
Follow the current product instructions and weather requirements.
Which Has Better UV Protection?
This comparison is a little more nuanced.
TWP states that the 1500 Series provides higher UV protection than the 100 Series.
Both products contain pigments that help reduce UV-related graying and fading.
Independent testing found strong UV performance from both formulas.
DeckStainHelp’s 2026 comparison reported that both TWP 100 and TWP 1500 performed nearly identically for UV protection and color retention over two years.
So I would not choose between the two based only on UV protection.
The color you select also matters because pigment plays an important role in protecting wood from sunlight.
If your deck receives intense sunlight, see our guide to the best deck colors for hot climates.
TWP 100 vs 1500: Which Has Better Colors?
Both products offer semi-transparent colors, but the color names are not necessarily exact matches between the two series.
The current TWP color information lists different color ranges for the 100 and 1500 Series.
TWP 100 includes colors such as:
- Cedartone
- Honeytone
- Rustic
- Pecan
- Redwood
- Dark Oak
- Prairie Gray
- Driftwood Gray
- Clear
TWP 1500 includes:
- Cedartone
- Redwood
- Dark Oak
- Black Walnut
- California Redwood
- Honeytone
- Rustic
- Pecan
- Natural
TWP specifically warns that final color depends on the wood species, age, condition, preparation and application.
This means you should not assume that a 100 Series color will look exactly the same as a similarly named 1500 Series color.
Always test a sample on your actual wood.
TWP 100 vs 1500 Coverage
Both products are penetrating stains, so coverage can vary significantly.
The amount required depends on:
- Wood species
- Wood age
- Porosity
- Surface condition
- Preparation
- Application method
- Number of coats
Older, dry wood can absorb substantially more stain than newer or dense wood.
For large projects, use our free deck stain calculator before purchasing.
Do not calculate only the square footage of the deck floor.
Include stairs, railings and other wood surfaces if they will also be stained.
How Many Coats?
Both TWP 100 and TWP 1500 are generally applied as one to two coats wet-on-wet, depending on the wood and its porosity.
The important point is that the second coat is not simply applied after the first coat has completely dried.
TWP’s application instructions call for the second coat to be applied wet-on-wet.
Applying excessive stain can create surface buildup.
If the wood cannot absorb the product, excess stain may remain on top.
That can lead to an uneven appearance and longer drying.
TWP 100 vs 1500: Which Is Easier to Apply?
Both are relatively straightforward penetrating stains when the wood has been properly prepared.
TWP 100 has an advantage in absorption because it penetrates faster.
TWP 1500 is also designed for easy application and maintenance.
Both can generally be applied using:
- Brush
- Stain pad
- Roller
- Pump sprayer
- Airless sprayer
Back-brushing or using a stain pad can help distribute excess product.
Do not leave puddles of stain sitting on the surface.
Surface Preparation for Both Products
Good preparation is more important than choosing between TWP 100 and TWP 1500.
The deck should be clean and free from dirt, mildew and incompatible coatings.
Preparation may include:
- Cleaning the deck.
- Removing failing finishes.
- Removing mildew.
- Brightening the wood when appropriate.
- Allowing the wood to dry.
- Testing the stain.
- Applying the product according to the manufacturer’s instructions.
If you are preparing an older deck, start with our guide on how to clean a deck the right way.
You can also see our recommendations for the best deck cleaners.
If an old coating is peeling or failing, more extensive preparation may be necessary.
Can You Use TWP 100 or 1500 on New Wood?
New wood requires special attention.
TWP and independent testing guidance recommend allowing new wood to weather before staining so the surface can accept the product properly.
Freshly milled wood can be too smooth and dense for proper penetration.
The appropriate waiting period can vary by wood type and condition.
Do not automatically stain new boards immediately after installation.
If you are planning a new deck, our [wood deck guide] covers other important decisions including wood selection, costs and planning.
TWP 100 vs 1500 on Cedar
Both can be good choices for cedar.
Cedar is relatively porous compared with many hardwood decking species, making it well suited to penetrating stains.
The choice between 100 and 1500 mainly comes down to VOC regulations and your preference.
If TWP 100 is permitted where you live, it provides the original higher-VOC formulation.
If you want a lower-VOC product, TWP 1500 is the logical choice.
TWP 100 vs 1500 on Pressure-Treated Pine
Both products can be used on pressure-treated wood once the wood is properly prepared and ready to absorb stain.
Pressure-treated lumber can initially contain significant moisture.
Staining too early can interfere with penetration.
Allow the wood to reach the appropriate condition before applying either product.
TWP 100 vs 1500 on Ipe, Cumaru and Other Hardwoods
This is where I would be more cautious.
Dense hardwoods such as Ipe and Cumaru do not behave like cedar or pressure-treated pine.
They can be difficult for penetrating stains to absorb.
TWP’s current information and independent testing guidance do not make these products the obvious choice for every exotic hardwood application.
If you have Ipe decking, read our Ipe deck guide.
For Cumaru, see our guide to Cumaru wood decking.
For Garapa, see our Garapa decking pros and cons article.
Which Lasts Longer: TWP 100 or 1500?
There is not a major difference in expected deck longevity based on the available evidence.
TWP and independent testing generally put the maintenance interval around 2–3 years for horizontal deck surfaces, although conditions vary.
Sun exposure, moisture, traffic, wood species and preparation can all affect longevity.
DeckStainHelp’s 2026 comparison found both formulas performed very similarly over two years.
So I would not choose TWP 100 simply because you expect it to last substantially longer.
TWP 100 vs 1500: Peeling and Maintenance
Both are penetrating stains.
That means they are different from thick film-forming finishes that can peel or flake dramatically.
Independent testing reported very little peeling from both products.
As the stain wears, the color gradually fades.
This makes maintenance relatively straightforward when the existing finish has weathered evenly.
For ongoing care, see our wood deck maintenance guide.
If the deck has serious deterioration, read deck repair vs replacement before simply applying another coat.
TWP 100 vs 1500: Which Is Better?
Choose TWP 100 if:
- It is legally available in your state.
- You prefer the original higher-VOC formula.
- Faster absorption is important.
- You want slightly deeper penetration.
- You are comfortable following the product’s VOC requirements.
Choose TWP 1500 if:
- You live in a VOC-restricted state.
- You want a lower-VOC formula.
- You want a product available throughout the U.S.
- You prefer the 1500 color range.
- You want strong UV protection.
- You want an alternative that performs similarly to TWP 100.
TWP 100 vs 1500: Pros and Cons
TWP 100 Pros
- Original TWP formula
- Excellent penetration
- Faster absorption
- Faster drying
- Oil-based
- Semi-transparent
- Good water resistance
- Strong UV protection
- Natural-looking finish
- Good choice where legally permitted
TWP 100 Cons
- Higher VOC
- Restricted in certain states
- Not as widely available
- Color range differs from 1500
- Requires proper surface preparation
- Regular maintenance is still required
TWP 1500 Pros
- Lower VOC
- Available in all 50 states
- Oil-based
- Semi-transparent
- Good penetration
- Strong UV protection
- Good water resistance
- Helps resist mold and mildew
- Natural wood appearance
- Similar real-world performance to TWP 100
TWP 1500 Cons
- Slightly slower absorption
- Generally slower drying
- Colors are not exact matches to the 100 Series
- Requires careful preparation
- Requires periodic maintenance
- May not be ideal for very dense hardwoods
TWP 100 vs 1500: What Do Independent Tests Show?
Independent testing is useful because it provides information beyond the manufacturer’s specifications.
DeckStainHelp’s 2026 comparison tested both TWP formulas over two-year periods.
Its current ratings are:
- TWP 100: 8.69/10
- TWP 1500: 8.5/10
The testing reported very similar performance for UV protection, mold resistance and ease of maintenance.
That suggests the practical difference between the two products is smaller than the product names might suggest.
The manufacturer, however, does identify some formula differences. TWP says the 100 Series penetrates better and dries faster, while the 1500 Series provides higher UV protection and lower VOC emissions.
Therefore, I would not describe TWP 1500 as a major downgrade from TWP 100.
It is better viewed as the lower-VOC alternative.
TWP 100 vs 1500: Price
Price can change depending on the retailer, container size and color.
Current listings show both products sold in 1-gallon and 5-gallon sizes.
For a large deck, calculate your expected coverage before comparing the gallon price.
A cheaper gallon is not necessarily cheaper overall if the product requires more material for your particular wood.
Final Verdict: TWP 100 or TWP 1500?
For most homeowners, I would choose TWP 1500 unless TWP 100 is legally available and you specifically want the higher-VOC formula.
TWP 100 has some technical advantages. The manufacturer says it penetrates better, absorbs faster and dries faster.
However, these differences do not translate into a dramatic difference in real-world deck performance.
Independent two-year testing found that both formulas performed very similarly.
The biggest practical difference is VOC compliance.
If TWP 100 is restricted where you live, TWP 1500 is the obvious choice.
If both are available, TWP 100 may appeal to homeowners who want deeper penetration and faster drying. TWP 1500 makes more sense if you prefer the lower-VOC formula or want the broadest availability.
Overall winner for most homeowners: TWP 1500.
Winner for penetration and faster absorption where legally permitted: TWP 100.
The final result, however, depends heavily on the wood and preparation. A properly cleaned and prepared deck with the right stain will generally perform better than a poorly prepared deck using the supposedly “better” formula.
Frequently Asked Questions
Is TWP 100 better than TWP 1500?
Not necessarily. TWP 100 penetrates and dries faster according to the manufacturer, while TWP 1500 has lower VOCs and is available in all 50 states. Independent testing found similar overall performance.
What is the main difference between TWP 100 and 1500?
The biggest difference is VOC content. TWP 100 is listed at 550 VOC, while TWP 1500 is listed at 350 VOC and is compliant in all 50 states.
Does TWP 100 last longer than TWP 1500?
There is no strong evidence that TWP 100 lasts dramatically longer. Independent testing found similar performance, with typical deck maintenance needed around every 2–3 years.
Does TWP 1500 penetrate as well as TWP 100?
TWP says the 100 Series penetrates better and has a faster absorption rate. However, independent testing found the two formulas performed similarly overall.
Can I use TWP 1500 instead of TWP 100?
Yes, in many applications. TWP 1500 is the lower-VOC alternative and is available in all 50 states. It is not necessarily a downgrade in practical deck performance.
Are TWP 100 and TWP 1500 colors the same?
No. Some colors have similar names, but the color results are not necessarily identical. TWP recommends testing the actual color on your wood before applying it to the entire deck.
Which is better for cedar: TWP 100 or 1500?
Both can work well on cedar. The choice mainly comes down to VOC regulations, desired formula and color. TWP 100 has faster absorption, while TWP 1500 is the lower-VOC option.
Which is better for pressure-treated wood?
Both can be suitable once pressure-treated wood has weathered sufficiently and is properly prepared. The wood must be dry and able to absorb the stain.
Which is better for a sunny deck?
Both provide UV protection. TWP says the 1500 Series provides higher UV protection, while independent testing found both formulas performed very similarly. Pigment color and proper maintenance are also important.
Can you put TWP 100 over TWP 1500?
Do not simply apply one over the other without proper preparation. If changing products or series, follow TWP’s current preparation instructions and determine whether the existing finish needs to be stripped, cleaned or brightened first.
Sources and Further Reading
- TWP — Difference Between TWP 100 and 1500 Series
- TWP — Stain Comparison
- TWP — Stain Colors
- DeckStainHelp — TWP Stain Review 2026: 100 vs 1500
- DeckStainHelp — TWP 1500 Review 2026