See Here for First Review: TWP 1500 Series Review
*Note: TWP 1500 and the TWP 100 are the only deck stains registered by the EPA as a wood preservative. The 1500 is compliant in all US states while the 100 Series is not.
TWP 1500 Stain Deck Stain Scores (1-10)
Appearance After Initial Stain Application: 8.5
For the pine deck we used the TWP 1530 Natural. This is not a “clear” but rather a traditional cedar color in our opinion. The manufacturer stated they made this color in the 1500 Series to match the color of the TWP 101 Cedartone. This allows for an easy switch from the 100 Series for consumers who are in a low voc state.
The wood grain was highlighted naturally with the 1530 Natural semi-transparent tint. The 1500 does not mask or film on top of the wood grain.
Preventing UV Graying at 2 Year Mark: 8.5
Excellent at preventing UV graying at the two year mark. For the vertical railings, the TWP 1500 lost very little of the color. For the horizontals, we saw close to 80% color retention.
Same results as last time and one of the better products for preventing color fading
Wear/Tear and Peeling: 8
The TWP 1500 penetrates deep into the wood reducing the chance of wearing. We find that the 1500 Scored well here for a low VOC oil based stain.
Note that when staining brand new wood with TWP, we have found that it is best to let the wood season in the elements for at least 3+ months. Once it is weathered, we prep with a deck cleaner and wood brightener to enhance the stain penetration. Only 1 coat of the TWP 1500 for new smooth wood.
Cost Per Square Foot: 8
TWP 1500 Series cost us $38 per gallon. Coverage for the TWP 1500 on the pine deck was close to 1500 square feet per gallon for the first coat and 250 for the second coat. We used 5 gallons for the 450 sq. feet.
Preventing Mold/Mildew/Algae: 9
No mold in the sunny areas of the deck floor. There was some mold growing on top of the TWP around the railings. This was close to a pine tree though and may have been the cause.
This result is normal with TWP products as they contain an EPA registered fungicide and a mixture of natural and synthetic oils.
Ease of Application: 8
TWP 1500 series applies fairly well. It is slightly thicker then the 100 Series so you do need to be careful of not over applying. Make sure that all puddles that have not absored in 30 minutes are wiped down. Best to apply with a stain pad. Attach this to a pole and “work” the stain into the wood. You can spray as well but you will need to back wipe for an even appearance. The 1500 also takes a little longer to. Closer to 6+ hours. We have noticed that rain will not affect the 1500 Series as long as the stain has an hour or two to absorb.
Color Shifting (darkening) after 2 Years: 10
The 1500 Stain did not “darken” in color at the two year review. This is excellent for an oil based stain as many of the other brands have the darkening problem.
Difficulty of Reapplication: 8
TWP 1500 Series can be reapplied with a minor cleaning first with a good quality deck cleaner. We have found that the TWP can be easily removed if needed with a deck stain stripper as well.
Overall Score TWP 1500 Stain at 2 Year Period: 8.44
TWP 1500 Series is one of the better wood and decking stains and is one of our top choices. As contractors we really like stains that penetrate deep into the wood and can be reapplied without sanding. TWP 1500 fits this and more by adding excellent UV and mold protection. Maintaining with TWP every 2-3 years is easy.
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More Info: TWP 1500
Cost: $37.99 per Gallon, $184.99 per 5 Gallon Pail
Stain Type: Semi-Transparent – Oil-Based
Available Colors: 1500 Clear, 1501 Cedartone, 1502 Redwood, 1503 Dark Oak, 1504 Black Walnut, 1511 California Redwood, 1515 Honeytone, 1516 Rustic, 1520 Pecan, 1530 Natural
Application Temperature: 45-95 F
Coats Required: 1-2 Coats. “Wet on Wet”. Only 1 coat on new smooth wood.
Coverage Per Gallon: 150-250 sq. ft for first coat. 200-300 for second coat if applied.
Application Tools: Sprayer, Pad, Brush, Roller
Dry Time: 4-12 Hours
Cleanup: Mineral Spirits
VOC Compliant: 350 Compliant in all States (Registered as Wood Preservative by EPA)
More Info: Product Data
Manufacturer: Gemini Coatings
Test Deck Stats:
When Tested: Applied 2011 and Reviewed Summer 2013
Deck Wood Type: Pine Treated Decking
Deck Square Footage: 450 Square feet
UV Exposure: 50% Full Sun, 50% Shade. South Exposure.
How Many Years Tested: 2 Years
Stain Color Used: Natural 1530
*All products tested and results are from our experience as wood restoration contractors. We offer no guarantee of similar results. Take inconsideration that results may differ due to different wood types, exposure to UV radiation, and natural weathering.