TWP 100 vs TWP 1500: What's the Difference?
TWP 100 Series and TWP 1500 Series are both oil-based penetrating wood preservatives from TWP, and they look and perform very much alike. The big difference is VOC content, which decides which one you're allowed to buy in your state. Here's how they compare, based on TWP's own product information.
TWP 100 vs 1500 at a Glance
| TWP 100 Series | TWP 1500 Series | |
|---|---|---|
| VOC | 550 g/L | 350 g/L |
| VOC-regulated states | Can't be sold there | Compliant in all 50 states |
| Formula | Original oil-based preservative | Same base formula, adjusted for VOC rules |
| Dry time (per TWP) | About 24 hours | About 48 hours |
| Application | 1-2 light coats, wet on wet | 1-2 light coats, wet on wet |
| Coverage | 150-200 sq ft/gal first coat, 200-300 second | 150-200 sq ft/gal first coat, 200-300 second |
| Colors we stock | 9 | 10, including Black Walnut, California Red and Natural |
Which States Need TWP 1500?
TWP 100 can't be shipped to VOC-regulated states. We don't ship TWP 100 to California, Colorado, Connecticut, Delaware, the District of Columbia, Illinois, Indiana, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Northern Virginia, Ohio, Pennsylvania, Rhode Island, Utah, Vermont or Maricopa County, Arizona. In those areas, order TWP 1500 Series.
Is There a Difference in Performance?
TWP describes the 1500 Series as the same base formulation as the 100 Series with minor formulation changes to comply with state VOC regulations. Both are oil-based, penetrate instead of forming a surface film, and won't peel when applied correctly. TWP lists a longer dry time for the 1500 Series, about 48 hours versus about 24 for the 100 Series.
Is TWP Stain Oil-Based?
Yes. Both TWP 100 and TWP 1500 are oil-based. TWP also makes the TWP 200 Series, a separate formula.
How to Apply TWP
- Clean and brighten the wood. The Gemini Restore-A-Deck kit is made for it. Let the wood dry about 48 hours.
- Apply between 50°F and 85°F, with no rain expected.
- Brush, pad or spray a light first coat, working a few boards at a time.
- On older or thirsty wood, apply a second light coat wet on wet, within about 30 minutes of the first. New wood usually needs one coat; TWP recommends letting new wood weather 4 to 12 months before staining.
- Back-brush any puddles so the stain soaks in.
How Much TWP Do I Need?
Plan on 150-200 sq ft per gallon for the first coat and 200-300 for the second, and less on rough or very weathered wood. Use our deck stain coverage calculator to work out gallons.
Which Should I Order?
- Shipping to a VOC-regulated state: TWP 1500.
- Anywhere else: either one. TWP 100 dries a little faster.
- Big deck or fence: the TWP 100 5 gallon or TWP 1500 5 gallon pails save money.
Questions? Email Sales@TheStainDepot.com. Orders placed before 4pm ET ship the same day.