FAQs / Product Knowledge Base

Search the FAQs Knowledgebase Browse by Category

The finish has dried with bubbles on the surface and looks like orange peel in places. What causes this?

FAQ Details

Last Updated
13th o May, 2008

Generally bubbles, orange peel effect and brush strokes or roller marks are a result of the application process, and can be caused by several reasons.
  1. The finish is drying too quickly. If the finish is worked too vigorously excess bubbles are created and the vigorous brushing or rolling stimulates faster drying. If the coat is rolled too thin it dries faster. Either way a quick drying finish thickens rapidly reducing the time required for the bubbles, brush or roller marks to level out and become smooth. An orange peel effect is created by a roller after a finish has become too thick to completely level out and become smooth. Apply an even coat and do not over work by brushing or rolling too many times.
  2. Applying finish when ambient and or surface temperatures are at or above 27°C are likely to encounter rapid drying, which is another cause of the above surface ‘imperfections’. Care must be taken to ensure a ‘wet edge’ is maintained and if necessary add FLOWMATE Wet Edge Extender to slow drying and to ensure an even consistent flow of the finish is maintained.
  3. Applying finish when ambient and or surface temperatures are at or below 13°C are likely to encounter rapid thickening, which is a further cause of the above surface ‘imperfections’. Care must be taken to ensure an even consistent flow of the finish is maintained and therefore if necessary at low temperatures add FLOWMATE Wet Edge Extender.
  4. Extra care must be taken when applying reduced sheen finish (MONOTHANE SEMI GLOSS, MONOTHANE SATIN, or MONOTHANE MATT), as these finishes all contain a matting agent that rises to the surface as the finish dries. Accordingly the need to maintain an even consistent flow of the finish is increased and therefore give special attention to preventing drafts flowing over the project while applying the finish. If possible filter direct sunlight from the project with curtains and make every effort to have a constant temperature in the area of the project and across the entire surface to be finished.
Visitor Comments
  1. Comment #1 (Posted by Vevin )
    The finish has dried with bubbles on the Surface and looks like orange peel in places. Typically 'Orange Peel' is the signature of the roller used to apply the finish - this has occurred because the finish has dried quickly - it has transitioned from a liquid to a solid before it can self level. Many factors, separately or in combination, influence fast drying including; high ambient and/or substrate temperature, high humidity (in the case of moisture cure products), thin film, a draft flowing across the freshly rolled out film, a hot spot in the substrate, viscous product, use of product close to the end of the pot life, etc. A bi-product of curing Polyurethane is CO2, which escapes from curing film, however if the film has dried quickly the CO2 may have become trapped as small bubbles. Buff the cured film with a #150 screen back removing all surface imperfections, vacuum, tack rag with a damp anti- static mop removing all traces of dust and re-coat. Plan to coat when the ambient temperature is around 15-25oC, and there are no hot spots on the substrate. Control any drafts flowing over the floor. Apply Monothane at the rate of 10m2 per Litre. If the area to be coated is 100m2, decant 5 Litres of Monothane, add 2% (20mls/Litre) Flowmax Anti Rejection Fluid and 3% (30mls/litre) Flowmate Wet Edge Extender, mix thoroughly and use a 6mm Mohair roller to coat the first 50m2 - this will ensure the pot life is good. Mix another mix as above and coat the second 50m2.

Post Comment for "The finish has dried with bubbles on the surface and looks like orange peel in places. What causes this?"

To post a comment for this FAQ, simply complete the form below. Fields marked with an asterisk are required.
   Your Name:
   Email Address:
* Your Comment:
* Enter the code below:

 
Related FAQs
No related FAQs were found.
Attachments
No attachments were found.