TWP Natural Effect Impregnating Stain Review  4.7/5 (4)

This post was updated on March 12, 2024

2024 TWP Natural Effect Impregnating Stains

TWP® Natural Effect utilizes state-of-the-art European waterborne technology and is designed to revolutionize exterior wood maintenance… …while at the same time significantly enhancing performance!

Spend more time enjoying your investment and less time maintaining it with TWP Natural Effect.

Natural Effect is the superior way to beautify and protect your exterior wood investment!

  • It can be used on all exterior wood types…
  • A Water-Based Exterior Wood Finishing System…
  • Utilizing European Waterborne Technology…
  • Designed to Revolutionize Exterior Wood Maintenance, While Significantly Enhancing Performance…


  • TWP Natural Effect Impregnating Stain is part one of a two-part exterior system. Must be top-coated with TWP Natural Effect Top Coat Step 2 for ultimate protection in an exterior environment.


TWP Natural Effect Impregnators are easily applied by brush, roller, pump sprayer, or traditional spray equipment. As with any waterborne system technology, they go on milky and they “clear” as they dry. No matter how inconsistently or unevenly applied, the color is perfect even when dry.


TWP Natural Effect Impregnators are tinted with iron oxide pigments, contain UV absorbers, and are extremely resistant to solar radiation. Their function is to preserve the wood from degradation (UV light, microorganisms, etc.), thus preventing the change in color of the wood, in addition to promoting adhesion of the Natural Effect Finish.

TWP Natural Effect Impregnating Stain Rating (1-10)

Appearance After Initial Stain Application: 8

– We used the Chestnut color on a PTP deck. This color had a nice rich reddish brown and really made the wood stand out. The stain applied evenly with no blotchiness and 100% penetrated the wood grain. Adding the TWP Natural Effect Top Coat (Step-2) gave an added boost and made it “pop” with a slight satin sheen.

Preventing UV Graying at 2 Year Mark: 9

– The TWP Natural Effect Stain has excellent color retention. The test was done in 2021 and to this day, the stain is still retaining excellent color on the PTP wood. The deck is fully exposed and in sun for about 70% of the day.

Wear/Tear and Peeling: 8

– The TWP Natural Effect Stain stain showed moderate signs of wearing on the wood, even after 2-3 years.

Cost Per Square Foot: 6

– TWP Natural Effect Stain costs $99.99 per gallon. This is the biggest negative we could find about this stain. We only needed one coat so that was a postive and helped offset the cost as many coatings need 2 coats. We used 6 Gallons for the one coat.

Preventing Mold/Mildew/Algae: 10

– After 2.5 years we have not found any mold or mildew on the TWP Natural Effect Stain stain.

Ease of Application: 9

– The TWP Natural Effect Stain is an easy stain to apply. Being water-based, it was slightly harder to spread than an oil-based stain. We used a flooring brush for the entire area. There was no need to backwipe.

Color Shifting (darkening) after 2 Years: 10

– The TWP Natural Effect Stain did not darken in color at the 2.5-year mark.

Difficulty of Reapplication: 8

– The TWP Natural Effect Stain will need to be cleaned with Gemini Restore-A-Deck Prep Kit to remove any dirt and grime, prior to reapplying.

Note: The Step 2 topcoat can be reapplied as needed and will prolong the life of the Impregnating Stain.

Overall Score TWP Natural Effect Impregnating Stain at 1 Year Period: 8.5

– We expected good results as all TWP Exterior Coatings are excellent and we were not disappointed. If you want superior UV protection in an eco-friendly water-based impregnating stain, then TWP Natural Effect would be a top choice.

Product Information:



Purchasing Info: TWP Natural Effect for Hardwoods
Cost: $99.99 per Gallon
Stain Type: Semi-Transparent – Water-Based Impregnating Stain for Hardwoods
Available Colors: Teak, Walnut, Mahogany, Black Ebony, Chestnut, Dark Walnut
Application Temperature: 45-95 F
Coats Required: 1 coat for most hardwood decking surfaces
Coverage Per Gallon: 200-300 sq. ft for Exotic Hardwoods
Application Tools: Sprayer, Pad, Brush, Roller
Dry Time: 2-6 Hours
Cleanup: Water
VOC Compliant: 250 Compliant in all States

Test Deck Stats:

Deck Wood Type:Pressure Treated Pine
Deck Square Footage: 800 Sq Feet
UV Exposure: 80% Shade 20% Sun
How Many Years Tested: 3 Years
Stain Color Used: 

*All products tested and results are from our experience. We offer no guarantee of similar results. Take into consideration that results may differ due to different wood types, exposure to UV radiation, and natural weathering.

Please Rate This. You may also post comments or ask questions below.

author avatar
Scott Paul ~ Restoring Wood & Decks Since 1993 Owner
As an article and comment contributor to the site, Scott has been around the pressure washing industry since attending college. In 1993 he started his first company called Oakland Pressure Wash specializing in exterior pressure washing and deck staining. That company evolved into OPW L.L.C. shortly thereafter concentrating more on exterior wood and deck restoration. Scott and his Deck Cleaning Michigan company have restored over 10,000 decks in the Metro Detroit area since the early years. He has become an authority in the deck restoration industry and has contributed to numerous wood restoration forums and informative sites. All the products he suggests through this site are sold through online sites and in retail stores, allowing the consumer to choose their own means of purchase. Scott’s eCommerce sites do sell many top brands he endorses and if you appreciate any of the help he has offered then feel free to purchase from one of them.
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