Buffing vs Sanding Hardwood Floors

The Short Answer

A buffer with a 120–150 grit screen removes microns of finish. Not millimeters. Not wear layer. Microns of the finish surface — just enough to create mechanical tooth for the next coat to bond.

It is not a sanding operation. It is a surface preparation operation.

Method	Material Removed	What Gets Removed	Purpose
Buffer / Screen (120–150g)	Microns (~0.01–0.05mm)	Top of finish coat only	Adhesion prep for new coat
Orbital sander (100g)	0.01–0.03mm	Finish + surface wood	Light refinish prep
Drum sander (60g)	0.05–0.10mm per pass	Finish + wood	Refinish, leveling
Drum sander (40g)	0.12–0.20mm per pass	Finish + wood	Aggressive leveling
Drum sander (36g)	0.15–0.30mm per pass	Finish + wood	Full sand, solid wood

Screening/Buffing — What It Actually Does

Abrades the topmost finish layer with an open-mesh screen (not sandpaper)
Creates a dull, uniform micro-scratch profile on the existing finish
Allows new polyurethane to mechanically bond to old finish
Does NOT touch the wood beneath
Does NOT level the floor
Does NOT address deep scratches, staining, UV discoloration, or cupping

Screening Is Appropriate When

Finish is dull but intact — no bare wood showing
Scratches are surface-level (clear, not dark/grey)
No contamination (wax, Orange Glo, oil-soap residue — test first)
Floor has not been treated with acrylic polishes (will cause crawling and fish-eye)

Sanding Is Required When

Gray, worn-through areas are visible (bare wood exposed)
Deep scratches that catch a fingernail
Dark or black scratches (dirt-filled, deep)
Cupping or board movement that screening cannot level
Color change required (stain removal or new color)
Prefinished UV finish needs to be fully removed for adhesion

⚠ The contamination test before screening: Apply mineral spirits to a cleaned, low-traffic area. Wait. Wipe. If the rag shows brown/yellow residue or a waxy feel, contamination is present — screening will smear it, not remove it, and screen-and-recoat will fail. Separately, apply water/ammonia (1:1 mix) to a cleaned area. If it turns white within 10 minutes, floor polish or wax is present. Remove with a 4:1 water/ammonia scrub before any recoat.

Own an engineered floor that needs work? See our Engineered Hardwood Refinishing service — free caliper wear-layer measurement included with every estimate.

Not Sure If Your Floor Needs a Buff or a Full Sand?

We run the contamination test and inspect the finish for free before quoting either.

Call 240-444-0748

“Buffing is maintenance. Sanding is surgery. Most floors need maintenance. Operating on a floor that needs maintenance guarantees a shorter lifespan.”

Frequently Asked Questions

When is screening appropriate instead of sanding?

When the finish is dull but intact with no bare wood showing, scratches are surface-level and clear (not dark or grey), there is no wax or oil-soap contamination, and the floor has not been treated with acrylic polishes that would cause the new finish to crawl or fish-eye.

When is full sanding required instead of screening?

When gray, worn-through areas show bare wood, scratches are deep enough to catch a fingernail, scratches are dark or black (dirt-filled), the floor has cupping or board movement, you need a color change, or a prefinished UV finish needs full removal for adhesion.

How do I test for contamination before screening?

Apply mineral spirits to a cleaned, low-traffic area and wipe it. Brown or yellow residue on the rag means wax or oil contamination that screening will smear, not remove. Separately, apply a 1:1 water/ammonia mix; if it turns white within 10 minutes, floor polish or wax is present and needs a 4:1 water/ammonia scrub before any recoat.

Buffing vs Sanding: The Real Numbers