Problems Solving (1)

Today, here are some problems you may face in the process of applying paint or after application of paint. Hope this blog can help you.

      1.Yellowing

Yellowing applied paint (white & clear varnishes) on aging.

What causes it?

·Alkyd/ oil based paint applied surfaces tend to become yellowish when they are not exposed to sunlight, specially inside colsed cupboards or covered areas, due to their chemical nature.

·Staining due to tobacco

·Moisture and other environmental contaminants.

  How to solve it?

·If prevailing environmental conditions to yellowing exist, it is not worth repainting with same type of paint.

·Use non yellowing paint.

 

        2. Wrinking

Uncured paint forms a skin that makes the paint surface rough and crinkled.

What causes it?

·Paint applying too thicklt (specially alkyd or oilbase paint)

·Painting under too hot or cool damp weather, that dries top of the paint film quickly than bottom

·Exposure of uncured paint to rain, dew, fog or high humidity conditions

·Paint applied on insufficiently with wax or dirt

How to solve it?

·Scrape or sand substrate to remove wrinkled coating & make the surface smooth to blend with surrounding.

·If using a primer. allow it to dry completeky before applying top coat

·Repaint the area (avoiding temperature or humidity extremes), applying an even coat of paint

 

          3.Uneven Gloss (Flashing)

Uneven appearance of the coating gloss due to decoration of paint film or uneven  appearance of gloss or luster.

What causes it?

·Use of a gloss alkyd/ oil based paint or solvent-based epoxy in areas of direct sunlight

·Heavy dew, moisture, or condensation getting onto a coating (e.g. primer, paint or stain) while drying

·Temperature fluctuations during drying

·Coating over a porous surface

·Paint applied at uneven film thickness (i.e. lapping)

·Insufficient film build (e.g. coating applied too thin)

·Use of an interior paint outdoors

How to solve it?

·Wash the chalk off paints. It will give glossy finish, but alkyds/oil-based paints chalk again. It is advisable  to recoat with a acrylic paint for exterior use

·Use suitable primer prior to paint on bare substrates

·Level off patchy areas to level the porosity of the surface

·Should thin touch up coating to get uniform gloss.

·Follow instructions for appropriate application environment conditions

·Follow the label instructions for adequate film build and thinning.

 

            4.Staining

Change of surface colour due to anything that would bleed, leak, or stick to the paint film.

 

 

What causes it?

·Water

·Tobacco smoke, fire smoke and soot damage

·Grease and oil

·Rust

How to solve it?

·Water stains should be treated initially by repairing the source for water leak. Remove excessively damaged plaster or wood or pealing paint. Use stain resistant primer for stained area before repainting.

·Tobacco smoke stains., fire smoke stains, soot and grease and oil should be removed by appropriate cleaner. Primer stained area before repainting.

·Rust should be mechanically removed by rush or power tool and prime with a rust inhibiting primer or anticorrosive primer before repainting.

 

             5.Sagging

Horizontal run of a paint just after application. That will result for uneven paint film.

What casuses it?

·Application of heavy paint coat

·Application of over thinned paint

·Painting over a smooth surface that can’t adhere paint well

·Application on surfaces that are contaminated with oil or too moist

How to solve it?

·If it is still wet, re-brush with lightest touches

·If it has started drying, wipe the sag off, sand and repaint

·Sand the gloosy surfaces

·Avoid painting in over humid or cool conditions

·Do not over thin the paint – follow instructions given in the label

·Do not over apply the paint

 

             6.Peeling – Plaster

Peeling is separation of paint film from earlier paint layer (intercoat peeling) of from a substrate

 

What causes it?

·Painting over a surface with poor surface preparation such as dirty, wet or shiny

·Hard surfaces that have slick, which reduces addition

·New plasters with high alkalinity that require priming

·Old or Powdery surfaces

·Lower quality paint

How to solve it?

·Remove any peeling by sanding or scraping

· Repair powdery surfaces with a vinegar solution (1 pint vinegar to 1 gallon water) until substrate is hard. Wash with clean water and allow to dry.

·All new plasters should be allowed to dry for 90 days before painting. If painting cannot wait for 90 days, allow to dry 7 days and prime with appropriate alkali resisting primer and paint

 

             7. Peeling Due to moisture (inside)

Loss of paint film’s addition to plaster due to moisture, that penetrates through paint film and push out the paint film outside the substrate.

What causes it?

What causes it?

·Excessive moisture in a home due to cooking, showering or hot tub

·High level of humidity in the basement and/ or foundation

 How to solve it?

·Proper ventilation for high moisture areas such as bathrooms

·Heavily insulated or sealed homes need ventialtion in walls and/or roof

·After proper ventilation installed, remove peeling paint and prime underling surface

 

               8.Peeling Due to moisture (outside)

Exposing bare surface of exterior walls due to poor adhesion of paint film.

What causes it?

·Loosen of paint film by seeping water under the paint film

·Not caulking joints, corners, and openings allow moisture to enter

·Blocked gutters and leaking roofs cause moisture to build up

·Migration of interior moisture to out

·Painting damp and/ or condensed walls

How to solve it?

·Remove loosen material and test the coating 6 to 12 inches radius around peeled area

·Fill cracks and joints with suitable crack filler

·Clean clogged gutters and repair damaged roofs

·Prime the surface with water resisting primer