TWP 100 Series: Total Wood Protection

By Mark Williams | Exterior Remodeling Expert

When you walk into a big-box hardware store looking for deck stain, the shelves are almost entirely lined with thick, acrylic, water-based stains. While these are easy to apply and easy to clean up with soap and water, they act very much like paint: they form a film on top of the wood that eventually peels, cracks, and flakes within a year or two.

Professional deck restoration contractors like myself almost exclusively avoid water-based films. We use deep-penetrating oil-based stains. And TWP (Total Wood Protection) 100 Series is widely considered by the pros to be one of the absolute best products in the industry. I trust it on my most expensive cedar deck projects.

An EPA-Registered Wood Preservative

What separates TWP 100 from a standard decorative stain is that it is actually classified as an EPA-registered wood preservative.

It contains a complex blend of chemicals and algaecides specifically designed to prevent structural rot, decay, and mildew. When you apply TWP, the thin, highly refined solvent-based oil penetrates deeply into the cellular pores of the wood. It doesn't just color the surface; it structurally fortifies the wood fibers from the inside out, repelling water and preventing the boards from splitting, cupping, or rotting.

The Semi-Transparent Finish (Never Peels)

TWP 100 is designed to highlight and enhance the natural beauty of the wood grain, not hide it under a solid layer of pigment.

• The Colors: Classic colors like Pecan, Rustic, and Dark Oak provide incredibly rich, vibrant tones that can make cheap, green pressure-treated pine look like expensive western red cedar or mahogany.
• The Maintenance Advantage: Because it penetrates the wood rather than sitting on top as a film, it will never peel or flake. When it eventually wears down from intense UV exposure (usually after 2-3 years on a horizontal deck), it simply fades. This makes re-coating incredibly easy for me and my clients: we simply wash the deck and apply a fresh coat. No miserable, back-breaking sanding or chemical stripping required.

Pros and Cons from the Field

My Experience (Pros)

• Rot Protection: EPA registered to stop decay.
• No Peeling: Penetrating oil means it will never flake off.
• Easy Maintenance: Re-coating takes a fraction of the time of film-forming stains.
• Aesthetics: Deep, rich colors that highlight the wood grain.

My Experience (Cons)

• Dry Time: It can take several days to fully cure and dry to the touch, depending on humidity.
• Application: Must be applied "wet on wet" to avoid lap marks.

The Solvent Catch: VOC Restrictions

The primary reason TWP 100 works so incredibly well is its high level of mineral spirits and powerful solvents. This thin consistency is what allows it to penetrate so deeply.

However, this chemical makeup comes with two massive drawbacks for homeowners:

1. Odor: It smells very strong (like toxic chemicals) during application and for a few days after.
2. Legality: Because of strict Volatile Organic Compound (VOC) environmental laws, TWP 100 is absolutely illegal to sell, ship, or use in several states, including California, New York, New Jersey, Pennsylvania, and parts of the Northeast.

(Note: TWP does manufacture a 1500 series that is VOC compliant for these restricted states, though professionals often prefer the original 100 series if legally available in their area due to its superior penetration).

If you live in a state where it is legally available and you want to protect your expensive deck from rot for years, TWP 100 is an elite choice.