Most common technical FAQ by finishing with waterbased top finishes

1. Bubbles/Blisters in the surface.

  • Causes: Draft across finish surface. Rolling too quickly. Fast dry-ing. 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).

9. Do not store the finish in an excessively hot or cold vehicle. Frozen finish that has thawed can result in problems with air bubbles in the finish.
10. Never use silicon products in the vicinity of finishing work.
11. Bear in mind that tools must not be wet when you begin finishing. Check for water inside the roller.
12. Remember that floor temperature can be much lower than air temperature.
13. Turn off powerful mechanical ventilation systems prior to finishing.
14. Reduce the floor-heating temperature prior to finishing.
15. Apply the finish in thinner coats (10-15 m²) if drying conditions are poor.
16. The ideal drying time of the seconnd and final coat should always be app. 2 hours to dust dry.
17. Let the previous coat dry a 10–12% moisture ratio prior to subsequent finishing.