Trouble Shooting

Commercial Flooring


Issue Appearance Cause


Wrinkling of the coating.

Recoating before the first coat had dried. Use of incorrect thinners to speed up drying. Applying incompatible coating over existing coating.

Bitty finish

Bits or small specks in dried finish.

Airborne particles settling on wet finish. Sanding dust not completely removed.

Chatter marks

Undulations or lines running across several boards.

Vibrations during the sanding process. May be due to the sanding machine or vibrations in the floor boards.

Cloudy finish

 The coating appears cloudy or milky.

Moisture trapped in the coating. Application in very humid conditions or in very poor ventilation.

Cratering (often refered to as Rejection)

Defects in the coating that resemble craters.

Contaminants on the floor such as grease, oil, silicone, wax, polish, some household chemicals. Incompatibility between old and new coating.

Delamination at board edges or ends

Coating peeling off at board joints.

Excessive vertical movement at board edges or ends.

Delamination between coats  One coat peeling off the next.  Insufficient sanding between coats. Incompatility between old and new coating.

Edge bonding

Splitting within boards. Wide irregular spaced gapping at board edges.

Incorrect coating used on new floors. Moisture cured polyurethanes and solvent based two packs should not be used on newly installed floors.

Gloss variation

Inconsistent sheen across the finish.

Variation in timber porosity. Rough patches in the timber. Uneven sanding. Insufficient mixing of the product.

Grain raising

Surface is rough to the touch after coating.

Insufficient sanding between coats.

Lap Marks

Visible brush or roller marks in finish.

Over working an area. Application in hot weather, causing the coating to dry too fast. Timber porosity.

Pimples / Bubbles / Pinholes

Bubbles in coating. Pin holes are bubbles that have burst.

Shaking the product excessively, and not allowing time for the foam to de-aerate. Over-working an area excessively.


Finish looks like a bed quilt. Occurs most often on parquetry floors.

Coating not flowing over gaps at board edges.

Swirl marks

Fine circular scratch marks.

Caused by the rotary sanding machine used in the sanding process.

White lines

White lines appearing in joints between boards. Stretching of coating due to excessive board movement.