Sansin Classic Natural Topcoat

Sansin Classic Natural Topcoat is a durable, breathable finishing coat designed to enhance and protect wood treated with the Sansin Classic 123 system. This clear, penetrating topcoat is formulated to boost water repellency, extend finish life, and highlight the natural beauty and grain of the wood without adding color or gloss.

It is ideal for log homes, timbers, and other vertical wood surfaces that require long-lasting protection but a natural aesthetic. Whether you’re preserving new work or extending the life of an existing Sansin Classic system, Natural Topcoat provides a final layer of defense while maintaining breathability and flexibility.

What Makes Sansin Classic Natural Topcoat Unique?

Unlike film-forming sealants, Natural Topcoat penetrates into the wood and bonds with the Classic system underneath. It delivers superior water repellency and UV durability without altering color or sheen. Its high breathability prevents moisture entrapment and supports long-term performance on both green and seasoned wood substrates.

Key Benefits of Classic Natural Topcoat

• Protective clear finish that highlights natural wood grain.
• Reinforces water repellency and UV protection of the Classic system.
• Excellent for log walls, timbers, and vertical siding.
• Allows wood to breathe—won’t peel, blister, or trap moisture.
• Ideal maintenance coat for Sansin Classic projects.
• Low-lustre appearance with natural matte effect.

Application Notes

• System Use: Apply as a clear final coat over Sansin Classic 3 or directly over colorless Classic base systems.
• Surface Preparation: Ensure wood is clean, dry, and free of previous finishes. Best results are achieved on wood with moisture content up to 25%.
• Tools: Brush, roller, or spray. Back-brush all applications to ensure even penetration.
• Mixing: Stir thoroughly before and during use. Do not shake.
• Dry Time: Dry to touch in 6 hours. Wait 24–48 hours before light exposure to water or UV.
• Temperature Range: Apply between 10°C and 30°C (50°F–86°F). Avoid direct sunlight and rain during application and cure time.

Coverage

Coverage Rate
250–350 sq. ft./gal

These figures are based on average conditions and can vary depending on factors such as wood porosity, surface preparation, and application method. For precise planning, it’s advisable to conduct a test application or consult with a Sansin dealer.

Maintenance Required

• Classic Natural Topcoat should be reapplied every 3 to 5 years depending on weathering and sun exposure.
• Inspect your logs or siding annually. If water no longer beads on the surface, recoat with Sansin Natural Topcoat or Sansin ENS.
• Spot-repair is possible without stripping when caught early. Light sanding may be required in high-wear areas.

Frequently Asked Questions

What is the purpose of Sansin Classic Natural Topcoat?

It’s a clear finishing layer designed to extend the performance of Sansin Classic 123 or preserve natural, untreated wood tones in low-traffic, vertical areas.

Does it change the color of the wood?

No. It enhances the depth of the wood grain without adding tint or gloss. It is completely transparent once cured.

Can I apply this over another stain?

Only apply over the Sansin Classic system. It is not designed to be used over other brands or film-forming coatings.

Is it breathable?

Yes. It penetrates the wood and remains breathable, allowing vapor to escape and minimizing moisture-related damage.

How long does Natural Topcoat last?

Typically 3–5 years depending on exposure. High UV areas may need reapplication sooner.

Can I apply it on decks?

No. It is not designed for horizontal or high-wear surfaces like decks or stair treads. Use Sansin Dec for those areas.

Will it make the surface slippery?

No. It leaves a low-lustre finish that doesn’t create a slick or shiny surface.

Can I use this product alone?

It’s best used as a final coat over the Sansin Classic system, but it may be applied as a stand-alone water repellent on bare wood where no color is desired.

How do I maintain it?

Wash the surface annually and reapply when water no longer beads. No stripping is needed if applied before weathering becomes severe.

Does it offer UV protection?

Yes, it contains UV inhibitors to protect wood from greying. However, it should be used with a colored base coat for optimal UV resistance.

Downloads

• 📎 Technical Data Sheet (PDF)
• 📎 Safety Data Sheet (PDF)