Floor Sanding Cost Sydney: Two Coats or Three, What's in the Quote?

In Sydney, a floor sanding quote that says "three coats" doesn't tell you much on its own. It might mean one primer and two topcoats, or three topcoats over bare timber. The product, its application rate and the drying time between coats decide how long the finish lasts. Before you compare floor sanding and polishing prices across NSW, ask each contractor to name the primer, the topcoat, the number of coats, the litres allowed and when the floor can be walked on.

The Number on the Quote That Rarely Means the Same Thing

Picture two quotes for the same 65 square metres of blackbutt in a Randwick semi. Both say "sand and polish, three coats". One is $1,400 cheaper. Neither names a product.

Most owners assume they're buying the same finish. They often aren't. "Three coats" can describe at least three very different coating systems:

• One primer or sealer plus two topcoats. This is a common manufacturer system for waterborne polyurethane.
• Three coats of the same topcoat over bare timber. Some products allow it. Others need a nominated primer first.
• One sealer, one topcoat and a final coat that's only applied "if required". This turns the third coat into an allowance, not a commitment.

The difference shows up later in wear, sheen, colour and how often the floor needs recoating. It doesn't show up on the day the floor is handed back.

Elyment has looked at the preparation side of sanding quotes before, including whether gap filling is included in a floor sanding quote. This article covers the next line on the same quote: the coating system itself, and how it affects the cost, the timeline and access to the property.

What a Timber Floor Coating System Is Made Of

A coating system is a sequence of compatible products, each with its own job. A timber floor isn't finished with just "polish".

Primer or sealer

• What it does: Bonds the system to bare timber, controls how the finish soaks in, can bring out colour and may reduce edge bonding between boards.
• What the quote should state: Product name, number of coats, and whether it's needed for the topcoat specified.

Stain (optional)

• What it does: Changes the colour of the timber.
• What the quote should state: Colour, product, sample approval, and drying time before sealing.

Topcoat

• What it does: Provides wear resistance, sheen and the final feel underfoot.
• What the quote should state: Product, one-pack or two-pack, sheen level and number of coats.

Intermediate abrading

• What it does: Gives the next coat a key and removes raised grain or dust.
• What the quote should state: Whether it's included between coats.

The Australasian Timber Flooring Association's coating guidance sorts finishes into broad classes. These include penetrating oils and waxes, oil-modified urethanes, waterborne polyurethanes and solvent-based polyurethanes. Even within one class, performance can vary a lot. That's why a generic word like "poly" isn't a specification.

Why More Coats Don't Automatically Mean a Better Floor

A higher coat count sounds like better value. In practice, it's the system that decides performance, not the count.

Look at one manufacturer's published system. Bona's Australian specification for Traffic HD calls for one coat of a nominated primer, then two or three coats of the two-component waterborne topcoat. That means a properly specified premium system can be described as either three or four coats in total, depending on how the contractor counts.

Now compare that with three coats of a lower-grade one-pack finish applied straight onto bare timber. The second floor has more coats of topcoat. The first is still likely to be the tougher, longer-lasting floor, because the product class and the primer matter more than the count.

Extra coats can also cause problems when they're applied outside the manufacturer's limits:

• Too much film build in one day. Bona's Traffic HD technical data sheet warns against applying more than two full coats of primer or lacquer per day.
• Missed recoat windows. The same data sheet says that if a coat has dried for more than 24 hours, the surface needs intermediate sanding before the next coat goes on.
• Surface defects that get coated over. Dust, contamination or incompatible products can cause marks that another coat won't hide. Elyment explains one common example in why tiny craters appear in timber finishes.
• Edge bonding. ATFA notes that solvent-based polyurethanes carry a higher risk of edge bonding. This happens when the coating glues boards together, so seasonal movement opens up as larger, uneven gaps instead of small, even ones.

Coverage: The Line Item Almost No Quote Shows

Coat count tells you how many times the floor was coated. Coverage tells you how much product actually went on each time.

Manufacturers publish an application rate for each coat. Bona's Australian data for Traffic HD specifies 8 to 10 square metres per litre per coat, and 8 square metres per litre for its primers. A coat spread more thinly than that is still "a coat" on the invoice. It just has less protective film.

Indicative Product Consumption by Floor Area

30 m² – Two-bedroom apartment living area

• Primer at 8 m²/L: About 3.8 L.
• Two topcoats at 8–10 m²/L: About 6–7.5 L.
• Three topcoats at 8–10 m²/L: About 9–11.3 L.

65 m² – Semi or terrace ground floor

• Primer at 8 m²/L: About 8.1 L.
• Two topcoats at 8–10 m²/L: About 13–16.3 L.
• Three topcoats at 8–10 m²/L: About 19.5–24.4 L.

120 m² – Full single-level house

• Primer at 8 m²/L: 15 L.
• Two topcoats at 8–10 m²/L: About 24–30 L.
• Three topcoats at 8–10 m²/L: About 36–45 L.

These are indicative figures from one published product system, before wastage. Other products have different rates.

The point isn't for owners to measure litres on site. It's that a contractor who names the product and the expected volume has priced a real system. A quote that just says "three coats" leaves room for interpretation.

The Scheduling Impact Owners Often Miss

The coating system sets the programme as much as the sanding does. Every coat brings a drying period, and most product data is stated at about 20°C and 60% relative humidity. Sydney's humid summers, cool winter mornings and closed-up apartments can stretch those times.

Using Bona's published Traffic HD figures as an example, the timeline looks like this:

1. Primer: About 1.5 to 2 hours before the next coat.
2. Each topcoat: About 2 to 3 hours before recoating.
3. Daily limit: No more than two full coats per day, so a primer and three topcoats usually takes two working days.
4. Light foot traffic: About 6 hours after the final coat.
5. Full use: About 12 hours under normal conditions.
6. Rugs and covering: About 3 days.

Other products, especially oil-modified and solvent-based finishes, can take a lot longer to dry and cure. That affects decisions well beyond flooring:

• When furniture and appliances can be moved back in.
• When painters, cabinetmakers and electricians can return.
• When a rental property can be handed to a new tenant.
• Whether the household needs somewhere else to stay for a night or two.

A cheaper system that needs an extra drying day can end up costing more once accommodation, lost rent or idle trades are counted.

Strata, Odour and Safety Considerations

In Sydney apartment buildings, the coating choice also affects neighbours and the owners corporation. Contractors may need to plan lift bookings, permitted working hours, ventilation and protection of common areas around several visits instead of one.

Many two-pack finishes use a hardener, and the product class affects how it should be handled. ATFA notes that isocyanate components in solvent-based polyurethanes, and in many waterborne cross-linkers, are respiratory sensitisers.

SafeWork NSW's guidance on isocyanates sets out how businesses should manage that exposure risk.

For owners, the practical question is simple: will anyone, or any pets, be in the home while coatings are applied and curing? The contractor should be able to answer from the product's safety data sheet.

Odour and ventilation are often what make strata committees and neighbours notice the work. Raising them before the booking is easier than dealing with a complaint halfway through the job.

How to Compare Two Sanding and Polishing Quotes Fairly

The NSW Government's guidance on getting quotes recommends written quotes that describe the work and the materials.

For a coating system, that means comparing like with like.

Floor Sanding Quote Comparison Checklist

Use the following questions to compare Quote A and Quote B.

1. Primer or sealer

• Is the primer or sealer named?
• Quote A: __________
• Quote B: __________

2. Topcoat product and class

• Is the product specified as one-pack, two-pack, oil-based or solvent-based?
• Quote A: __________
• Quote B: __________

3. Number of topcoats

• Is the number of topcoats stated separately from the primer?
• Quote A: __________
• Quote B: __________

4. Sheen level and sample approval

• Is the sheen level specified?
• Is sample approval included?
• Quote A: __________
• Quote B: __________

5. Intermediate abrading

• Is intermediate abrading between coats included?
• Quote A: __________
• Quote B: __________

6. Product volume and application rate

• Is the expected product volume or application rate stated?
• Quote A: __________
• Quote B: __________

7. Site visits and working days

• Does the quote specify the number of site visits and working days?
• Quote A: __________
• Quote B: __________

8. Return-to-service times

• Are light-use, full-use and rug placement times stated?
• Quote A: __________
• Quote B: __________

9. Stairs, edges and thresholds

• Are stairs, edges and thresholds included in the scope?
• Quote A: __________
• Quote B: __________

If one quote can't fill most of this checklist, the price difference may simply reflect a different, undefined system.

Where qualifying residential building work is involved, NSW Fair Trading's home building contract requirements also apply.

Larger projects need written contracts, and variations should be agreed in writing.

Where the Coating Decision Fits in the Wider Renovation

The coating is the last flooring operation, so it's usually the one squeezed when earlier stages run late.

A few sequencing decisions protect it:

1. Confirm the floor can be sanded. Engineered boards have a limited wear layer. See whether engineered timber can be sanded before choosing a site-applied system.
2. Settle colour first. A stain or a colour change affects which sealer goes on and how long it needs to dry. Elyment's article on removing dark timber stain covers the limits.
3. Finish dusty trades before the final coats. Plastering, sanding of walls and electrical cut-ins should be done before the final topcoats go on.
4. Book painting around the cure, not just the dry time. Skirting paint and masking tape on a fresh floor can mark it.
5. Know when a site finish is the wrong choice. On some projects, a factory-finished board or a different floor type suits the programme better. Elyment compares the options in factory-finished vs site-finished timber flooring.

What Property Owners Should Take Away

• A coat count is a description, not a specification.
• Ask whether the count includes the primer or sealer.
• The topcoat's product class matters more than the number of coats.
• Coverage per coat decides how much protection the floor actually gets.
• Drying and recoat limits set the programme, the visits and when the property is usable again.
• A quote that names products, coats, rates and access times is easier to compare and easier to hold to account.

The best floor sanding quote in Sydney isn't the one with the most coats. It's the one that tells you exactly what goes on the floor, how much, and when you can use it again.

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Sources and References

Industry and Manufacturer Guidance

1. Australasian Timber Flooring Association – Coating Choices for Consumers
2. ATFA: Coating Choices for Consumers
3. Bona Australia – Traffic HD Standard Specification Paragraphs
4. Bona Australia: Traffic HD Standard Specification
5. Bona – Traffic HD Technical Data Sheet
6. Bona: Traffic HD Technical Data Sheet

NSW Government Guidance

1. SafeWork NSW – Isocyanates
2. SafeWork NSW: Isocyanates
3. NSW Government – Getting Quotes
4. NSW Government: Getting Quotes
5. NSW Fair Trading – Home Building Contracts
6. NSW Fair Trading: Home Building Contracts

Related Elyment Articles

1. Floor Sanding Cost Sydney: Is Gap Filling Included in Your Quote?
2. Elyment: Floor Sanding Cost Sydney – Gap Filling
3. Floor Sanding Sydney: Why Tiny Craters Appear in Timber Finishes
4. Elyment: Why Tiny Craters Appear in Timber Finishes
5. Timber Flooring Sydney: Factory-Finished vs Site-Finished
6. Elyment: Factory-Finished vs Site-Finished Timber Flooring
7. Engineered Timber Flooring Sydney: Can It Be Sanded Later?
8. Elyment: Can Engineered Timber Flooring Be Sanded?
9. Floor Sanding Sydney: Can Dark Timber Stain Be Removed?
10. Elyment: Removing Dark Timber Stain