Most common technical FAQ by finishing with waterbased primers

1. Visible applicator strokes, uneven colour after application of SEALER.

  • 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.