Powder Coated Balconies And Balustrade

Powder Coating

Powder coating is a modern alternative to wet or spray painting and is applied as a dry powder.

The main difference between a conventional liquid paint and powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension.

The coating is applied electrostatically and then cured under heat to allow it to create a hard finish that is tougher and much more durable than conventional paint.

The powder coating process involves three steps

Part preparation

Removal of all oils, lubrication greases, metal oxides, welding scales and grime etc. is essential prior to the powder coating process in order to for a perfect finish. It can be achieved by a variety of chemical and mechanical methods such as shot blasting or sandblasting.

Powder application

The most common way of applying the powder coating to metal objects is to spray the powder using an electrostatic gun. The gun imparts a positive electric charge on the powder, which is then sprayed towards the grounded object by compressed air spraying and then accelerated toward the workpiece by the electrostatic charge.

Curing

When the powder is exposed to a high temperature within a specialist convection or infra-red oven it begins to melt and then chemically reacts and bonds to form a higher molecular weight polymer.

Normally the powders cure at 200°C or 390°F for 10 minutes.

Powder coating Versus Spray or wet painting

Powder coatings can produce much thicker coatings than conventional liquid paints with no running or sagging

Powder coated items generally have fewer appearance differences than liquid coated items and are much more resistant to chipping and scratching.

A wide range of speciality effects is easily accomplished which would be impossible to achieve with other coating processes.

Very cost effective and more environmentally friendly compared to spray painting as there is no wastage from over spraying or hazardous waste produced.

With powder coating is is not as easy to apply very thin films.

On very small jobs, the cost of powder coating will be higher than spray painting.

Removing powder coating

Most organic solvents such as acetone, thinners, etc, are completely ineffective.

Traditionally methylene chloride was used but due to its carcinogenic properties it has been superseded by benzyl alcohol.

It can also be remove by shot and sandblasting or if you have a lot of spare time on your hands, low grade powder coating can be removed with steel wool.