Sitemap
Site Search
  Ok
 
 

Most common technical FAQ by finishing with waterbased floor finishes 

  

 

FIRST COAT

1. Visible applicator strokes, uneven colour after applicator finishing.

  • Causes: Uneven applicator finishing; finish has had time to dry between first and second applications. 
  • Corrective actions: Sand back to bare wood. Apply the first two coats “wet to wet” and keep the finish in motion when applying the initial coat without going all the way to the wall.

2. Round, dark, miss-colourations approximately 20–40 cm in diameter. 

  • Causes: poured finish has remained too long on the floor. The wood is absorbing excessive moisture and the finish is drying slower over these surfaces. 
  • Corrective actions: Sand back to bare wood and re-finish.

3. Dark, narrow lines/scratches. 

  • Causes: sanding scratches from coarse-grade sandpaper have not been sanded away; these absorb more finish and the colour darkens. 
  • Corrective actions: Sand to bare wood and
    re-finish.

4. White in joint between staves or boards.

  • Causes: cellulose finish mixed with sanding dust has been used for filling. Finish has been applied before this had dried. 
  • Corrective actions: sand to bare wood and remove all white from the joint.

5. Edge-gluing. The floor is without joints between boards, with the exception of some areas where the joints are very wide. 

  • Causes: the wrong type of finish has been used for the initial coat (adhesive properties are too good) and the wood has shrunk.
  • Corrective actions: remove the floor and relay it. Use correct finish for first sealer coat.

6. Light areas after roller application. 

  • Causes: too much air has worked into the lacquer and late overlapping. 
  • Corrective actions: Sand to bare wood and
    re-finish.

7. Course apparence, excessive grain raise, roller patterns, etc. 

  • Causes: excessively thick initial sealer coat has been applied. 
  • Corrective actions: perform a thorough intermediate sanding with used 120-grit paper or screen. Also flatten the surface gloss with an abrasive (maroon) pad.

8. Darker wood along the walls. 

  • Causes: excessively thick application with brush along the walls and/or brush application have begun to dry before overlapping with a roller. 
  • Corrective actions: sand to bare wood and
    re-finish.
  

SECOND OR FINAL COATING

1. Bubbles/Blisters in the surface. 

  • Causes: draft across finish surface. Rolling too quickly. Fast drying. Low relative humidity. Frozen finish or stored in low temperature for a longer period. 
  • Corrective actions: sand away the bubbles away entirely with used 120 or 150-grit sandpaper and re-finish. If heavy bubbles sand back to bare wood.

2. Particles in the surface. 

  • Causes: dust particles, dusty workplace, poor vacuuming. Unclean tools bad mixing hardener. 
  • Corrective actions: sand away with 150-grade sandpaper and re-finish.

3. Shrinkage/Fish eyes/Creeping 

  • Causes: silicone problem. Silicone contamination. Contamination of surfaces or tools. 
  • Corrective actions: sand back to bare wood. Avoid contamination from adjoining surfaces. Re-finish.

4. Uneven gloss 

  • Causes: container not agitated. Uneven application. Uneven drying. 
  • Corrective actions: sand the surface to an even gloss with 150-grit sandpaper or screen. Also flatten the surface gloss with an abrasive (maroon) pad.

5. Peeling/Bad adhesion

  • Causes: contaminated surface, Silicon on surface, grease on surface.
  • Corrective actions: sand back to bare wood.


6. Bad levelling, brush marks or roller structure in the surface.

  • Causes: Cold finish, cold floor. Mixing two brands. 
  • Corrective actions: if heavy marks sand back to bare wood. If just small marks sand with 150-grit paper or screen. Also flatten the surface gloss with an abrasive (maroon) pad.

7. Alligatoring, surface looks like the skin of an alligator. 

  • Causes: Too long drying time, too high humidity, too cold floor or water leaking out from the inside of the roller. 
  • Corrective actions: sand back to bare wood.

8. Bad drying 

  • Causes: High humidity, low temperature, too heavy (thick) coats or no air movements. 
  • Corrective actions: room temperature at least 13 °C , relative air humidity not over 80%. Good ventilation (not draught).
Additional information: 

- - - - - - - - -

- - - - - - - - -