Brushbox Flooring

Sanding, priming, and finishing guide for brushbox (Lophostemon confertus) -- a hard, even-grained Australian hardwood with a distinctive pinkish-orange colour that sands cleanly and takes stain exceptionally well.

Species characteristics

• Janka hardness: ~9.5 kN -- firmly in the hard category for Australian hardwoods. Comparable to blackbutt in resistance, requiring a full grit sequence with quality SIA belts.
• Grain: Fine, even, and generally straight. Minimal interlocking. This makes brushbox one of the most predictable species to sand -- the belt tracks evenly and the edger produces consistent results.
• Colour: Pinkish-orange to salmon, sometimes deepening to a warm reddish-brown with age. The colour is remarkably uniform across boards, giving brushbox floors a clean, cohesive appearance.
• Tannin level: Low. Despite being a native hardwood, brushbox does not carry the high tannin load of blackbutt or spotted gum. A general-purpose primer is sufficient under water-based topcoats.
• Common issues: Minimal. Brushbox is one of the easiest Australian hardwoods to sand and finish. The main risk is over-sanding at the edger -- the even grain makes it tempting to skip grits, but the uniform colour will reveal any scratch pattern under clear finish.

Recommended grit sequence

For a standard brushbox sand (existing floor, previous finish removed):

• Belt sander: P40 → P60 → P80 → P100 (SIA belts)
• Edger: Match the belt grits. P40 → P60 → P80 → P100.
• Buffer/screen: P120 screen or mesh to blend belt and edger zones.

Brushbox responds well to a standard grit sequence. The even grain means each grit removes the previous grit's scratch pattern cleanly. For floors in rough condition (heavy old finish, deep scratches), start at P24. Use the Grit Sequence Picker to get a sequence tuned to the exact condition.

Recommended primer

Bona Classic UX -- the right choice for brushbox. Classic UX is a general-purpose primer designed for low-tannin species. It seals the timber evenly and enhances the natural pinkish tone without shifting the colour too warm or too cool.

There is no need for a tannin-control primer on brushbox. The tannin content is low enough that bleed is not a risk under water-based topcoats. Classic UX provides even penetration on the fine, consistent grain.

Staining brushbox

Brushbox is one of the best Australian hardwoods for staining. The fine, even grain absorbs stain uniformly, producing consistent colour without the blotchy results common on more open-grained species. Bona DriFast Stain works well on brushbox -- apply after the final sand (P100 or P120), before primer. Test a sample area first to confirm colour intensity. For detailed technique, see the staining guide.

Recommended topcoats

• Bona Traffic HD: Commercial-grade 2K water-based. Maximum durability for high-traffic brushbox floors in commercial or heavy residential settings.
• Bona Wave 2K: Heavy residential 2K. Excellent durability at a more accessible price point. A strong choice for residential brushbox.
• Bona Mega: Single-component residential. Reliable and easy to apply. Suitable for standard residential traffic.
• Bona Traffic GO: Fast-cure 2K for same-day turnaround. Furniture back in 12 hours.

Common mistakes on brushbox

• Skipping grits because it sands so cleanly. The temptation on brushbox is to jump from P40 to P80 because the surface looks smooth. The uniform colour reveals every scratch pattern under clear finish. Sand every grit in sequence -- no shortcuts.
• Ignoring the edger blend zone. Brushbox's even colour makes the belt-to-edger transition line very visible if it is not blended. Buff the entire floor with a P120 screen after the final grit to eliminate the transition.
• Applying stain without testing. Brushbox absorbs stain evenly, but the pinkish base colour shifts the stain tone compared to what the stain tin lid shows. Always test on an offcut or inconspicuous area before committing to the full floor.
• Coating too quickly between coats. Brushbox's fine grain has lower porosity than more open-grained species. Each coat of primer and topcoat needs the full recommended dry time. Recoating too early traps solvent and causes adhesion problems.

FAQs: brushbox flooring

Does brushbox change colour over time?

Yes. Brushbox deepens from pinkish-orange to a warmer reddish-brown with UV exposure over the first 6-12 months. This is a natural process and is more pronounced under water-based finishes that allow more UV through than solvent finishes.

Is brushbox good for commercial flooring?

Yes. The 9.5 kN Janka hardness, even grain, and consistent colour make brushbox an excellent choice for commercial spaces. Pair with Bona Traffic HD for maximum wear resistance in high-traffic environments.

Can brushbox be finished with solvent polyurethane?

Yes. Solvent polyurethane (Handley Urethane) adds amber warmth to brushbox, shifting the pinkish tone toward a deeper reddish-amber. Some clients prefer this over the colour-neutral result from water-based finishes.

Tools

• Grit Sequence Picker -- pre-set for brushbox
• Primer Picker -- confirms Classic UX for brushbox
• Coverage Calculator -- litres of primer and topcoat for the job