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Cumaru Deck Maintenance Guide
Everything you need to clean, protect, and maintain Cumaru (Brazilian Teak) decking — weathering behavior, oil frequency, cleaning, color restoration, and species-specific care tips.
Janka Hardness
3,330 lbf
Lifespan
40–60+ years
Density
High (63 lbs/ft³)
Oil Frequency
Once per year for most climates
How Cumaru Decking Weathers
Natural Color
Golden tan to reddish-brown with medium grain
Weathered Color
Brown-gray fade
Weathering Speed
Moderate — Cumaru begins to fade within the first 3–6 months if left untreated.
Color Change Detail
Cumaru fades from golden-brown to a brownish-gray over 6–12 months. The color change is less dramatic than Tigerwood but more noticeable than Ipe.
Cleaning a Cumaru Deck
Cumaru cleans easily with a deck cleaner and soft brush. Its slightly more open grain compared to Ipe means dirt can settle into the surface, so regular sweeping helps.
Recommended Cleaning Steps
Clear furniture and debris. Sweep thoroughly.
Apply a tropical hardwood cleaner (DeckWise Hardwood Deck Cleaner, Messmers Deck Cleaner, or Penofin Pro-Tech Cleaner).
Scrub with a soft-bristled brush in circular motions. Focus on trouble spots.
Rinse thoroughly with a garden hose. Allow to dry completely before any treatment.
For stubborn stains, use Savogran TSP Eco Cleaner. Avoid household bleach on Cumaru.
How Often to Oil Cumaru Decking
Oil Frequency
Once per year for most climates. Cumaru responds well to annual oiling and maintains color better than many species between treatments.
Oil Absorption for Cumaru
Moderate — Cumaru accepts oil more readily than Ipe due to its slightly more open grain. One coat is usually sufficient; wipe excess within 20 minutes.
Recommended UV Oils for Cumaru
Messmers UV Plus for Hardwood
UV Oil
Ipe Oil® by DeckWise
Hardwood Oil
Penofin Exotic Hardwood
Penetrating Oil
Cumaru Tannin Bleeding & Runoff
Tannin Level
Low to moderate. Cumaru produces less tannin runoff than Ipe, but some brown discoloration on light surfaces is possible in the first few months.
Cumaru tannin bleed is typically mild and washes away naturally within 2–3 months.
Restoring Weathered Cumaru
Weathered Cumaru restores beautifully with sanding (60–80 grit) followed by an oil coat. The wood responds faster to restoration than Ipe due to better oil absorption.
Cumaru Maintenance Tips
Cumaru accepts oil well — one even coat is usually sufficient.
Annual oiling keeps Cumaru's rich golden color better than most tropical hardwoods.
End-seal all cut ends to prevent checking and moisture absorption.
Cumaru's slightly more open grain benefits from regular sweeping to prevent dirt build-up.
Consider a UV-blocking oil to preserve the warm tones longer between maintenance cycles.
Common Cumaru Maintenance Mistakes
Skipping the first-year oil treatment — Cumaru fades noticeably faster without early UV protection.
Using bleach-based cleaners that can lighten the wood unevenly.
Applying film-forming finishes that will peel and trap moisture.
Pressure Washing Cumaru
We do not recommend pressure washing Cumaru unless absolutely necessary and you have experience. Keep pressure below 1200 psi, use a wide spray pattern, and never hold in one spot.
Full Pressure Washing GuidelinesReady to explore Cumaru decking?
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Cumaru Maintenance FAQ
Common questions about maintaining Cumaru decking.
Once per year for most climates. Cumaru responds well to annual oiling and maintains color better than many species between treatments.
Cumaru naturally transitions from Golden tan to reddish-brown with medium grain to Brown-gray fade when left untreated. Moderate — Cumaru begins to fade within the first 3–6 months if left untreated. This is purely cosmetic — the wood remains structurally sound for 40–60+ years.
Cumaru cleans easily with a deck cleaner and soft brush. Its slightly more open grain compared to Ipe means dirt can settle into the surface, so regular sweeping helps. Use a tropical hardwood-approved cleaner such as DeckWise Hardwood Deck Cleaner or Messmers Deck Cleaner. Avoid harsh chemicals and keep pressure washing below 1200 psi if needed.
Weathered Cumaru restores beautifully with sanding (60–80 grit) followed by an oil coat. The wood responds faster to restoration than Ipe due to better oil absorption.
Sealing is optional but recommended. Cumaru won't rot or decay without sealing, but UV oil or sealer preserves the golden tan to reddish-brown with medium grain color. Without treatment, Cumaru weathers to brown-gray fade.
Low to moderate. Cumaru produces less tannin runoff than Ipe, but some brown discoloration on light surfaces is possible in the first few months.. Cumaru tannin bleed is typically mild and washes away naturally within 2–3 months.
Use oil-based penetrating sealers designed for tropical hardwoods: Messmers UV Plus for Hardwood, Ipe Oil by DeckWise, or Penofin Exotic Hardwood Formula. Avoid film-forming finishes (polyurethane, lacquer) — they peel on dense tropical hardwoods.