Peeling

 

Dried paint film tearing away from isolated portions of the coated surface

  • Failure to remove unstable matter during surface preparation
  • Failure to provide sufficiently etched surface for coating to cling on to
  • Oversanding/polishing/using a sandpaper grit that is too fine during surface preparation
  • Remove all loose paint film, dust, grease and other contaminants and ensure that the surface is sufficiently dry and clean prior to coating
  • Do not over sand / polish the wood prior to initial coating
  • Avoid using abrasives finer than #120 grit sandpaper for exterior applications

Water Damage

 

Blackened edges, and the surface may be damp to the touch

  • Over the years, varnish becomes hard and brittle, and  may develop cracks and splits on its surface as the timber expands and contracts
  • Liquid enters the joints and cracks and gets trapped underneath the surface. Mold grows in the damp environment
  • Failure to clean up spilled liquids promptly
  • Failure to provide bath mat outside the bathroom
  • Floods, or water leakage from cracked / burst pipes below the surface

– Floods / burst pipes / extensive water damage

  • Assess the extent of damage. Remove a small portion of the flooring and check if the sub-floor is still sound. If the plywood or runners have rotted, or suffers from termite infestation, a full replacement may be necessary
  • If there is a leakage, arrest and repair the source of the leakage

 

– Spills / mild water damage

  • Sand the timber floor to bare wood and allow the timber to dry off
  • The timber may warp or cup after drying. Replace any damaged pieces / planks and sand the floor again to level the timber
  • Re-coat the timber floor

Milky / Cloudy Appearance

 

The varnish turns whitish upon application, or when it is drying. Usually occurs with waterborne varnishes

– The varnish turns cloudy on the first coat

  • The varnish is applied too thickly. Water vapor is unable to escape the film

 

– The varnish turns cloudy on subsequent coats

  • Applying too many coats of varnish too quickly
  • Coatings have several stages of drying, namely, dust-free, touch-dry, hard dry, and full cure. Waterborne varnishes may be dry to the touch (touch dry) but is still wet underneath the film  (not yet hard dry). When another layer of coating is laid over a still-drying coating, The water vapor from the layer below is trapped under the top coat’s film, condensing as micro water droplets, forming the white cloudy patches
  • Avoid applying thick layers of coating. Follow the manufacturers’ recommended application rates
  • Halt coating once this phenomena appears and allow a longer time for the coat to fully dry before proceeding. The coating may revert back to clear if the water vapor has other means of escape (e.g from the edges). Otherwise, sanding off and re-coating may be necessary
  • Refer to manufacturer’s product specifications and adhere to the suggested drying interval timings. Waterborne varnishes generally take longer time to cure in cold and high humidity conditions (rainy weather or enclosed environments)
  • For best results, 3rd coats of waterborne varnishes should only be applied 16 hours after the application of the 2nd coat

Uneven Application

 

Patchy or uneven finish , with obvious stop marks of the applicator

  • Applied too thin a coat, causing the varnish to dry out before it can flow out evenly
  • Application was paused for too long

– For normal sized projects

  • Avoid long pauses in application. Waterborne varnishes, unlike solvent based varnishes, do not melt into the previous coat. Instead, the layers will stack up, causing the joining areas to be darker than the other areas
  • Avoid applying coats too thinly. Adhere to manufacturer’s recommended consumption rate or coverage

 

– For large projects

  • Strategize your application process
  • Break up the area into smaller sections and tackle them one by one. Aim to end the paint stroke at the edge of a plank
  • To avoid  joining lines, mark off the next section using masking tape
  • If in doubt, contact your Asia Paint representative for advise! We are always eager to help.

Improper Sanding

 

Uneven tones of finish, with obvious sanding stop marks, especially near the edges

  •  The previous coat was not sanded off completely
  • Waterborne varnishes, unlike solvent based varnishes, do not melt into the previous coat. The new coat dries to be a clear finish, revealing patches of the previous yellow-toned finish left on the timber
  • Sand off the affected areas to bare wood
  • Recoat the surface