POWDER COATING STEEL

The Process

Increasingly customers are looking for reliable coating of steel substrates.

At Sprint Coatings we do not use the nasty chemical pretreatments of other applicators. We use state of the art powder systems allied to strong mechanical pre-treatment systems.

The process is the same as for aluminium and steel with one very important variation – the use of a zinc rich primer

The work flow follows a 5 stage process:-

Mechanical Pretreatment

Powder coating electrostatically applied Primer

Green Curing the powder coating

Powder coating electrostatically applied Polyester top-coat

Full Curing the powder coating


Mechanical Pretreatment

Sprint Coatings uses blast cleaning to SA 2½, which is effectively to blast the steel to a clean grey finish, with most contaminants removed, and a very heavily etched surface. This contrasts to the mild ‘sweep blasting’ applied to softer galvanised substrates.

A Further 2 Coat Process

Working in harmony with the leading powder manufacturers, Sprint Coatings, applies a highly zinc rich containing primer. This then is put into an oven for curing, but not fully. A ‘Green’ cure, denotes a partial cure, the process of curing having been started.

Material is then coated with a normal polyester powder for exterior use and finally the material is fully cured. This ensures the 2 powder coat finishes bond together well.

Tests from our powder manufacturers, confirm the use of these products with this procedure can deliver an awesome, 3,000 neutral salt spray hours. This is a significant achievement and one which is attractive to customers looking for an effectively performing coating without the more rugged characteristics of a galvanised finish.