Stripe Coating

August 25, 2014
Lancaster, PA
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Stripe Coating

With developing technology, industrial methods are changing too. Painting is no exception, as chemists are creating improved paint for more complicated jobs. Industrial painting not only provides aesthetic properties to industrial objects but also gives a protective layer against corrosion and other damages. It is usually done at the point of manufacturing and there are several popular painting methods used today. Though these methods have improved in terms of their finish and uniformity of appearance, it is still not possible to get a 'perfect' product or machine with a single method. Areas like crevices, welds, edges, corners, pitted surfaces and others need separate handling and this is where stripe coating enters the picture.

Stripe coating is an essential part of commercial painting practices and offers protection for vulnerable areas like fasteners, welds and external corners. The type and number required by an object depends on the protective specifications created for that structure. These specifications are created based off industrial experience and latest coating practices. The basic function is to give a layer of thickness around edges as well as irregular surfaces. Generally, structures are given sprayed-applied coating because it is easy and fast, helping evenly spread the protective coat. But, it is found that the coating gets draw away from the edges and becomes thin. Also, it is not possible to get coating to areas around nuts and bolts, as well as flanges using spray. To bring evenness to the coating, brush striping is used in these areas. In brush stripe coating, painters use a brush to physically apply the coat on irregular surfaces and edges first. Along with brushes, the method also uses rollers for coating bigger areas. After that, the last coat is given to the structure using spray or any other coating technique. Applying the brush coat before the last coat helps in increasing the coverage and maintaining a smooth appearance. But, in this method, it is important to make sure that there is enough time for the stripe coat to dry before applying the last coat. Applying 'wet-on-wet' coats won't solve the purpose of applying brush stripe and may result in air bubbles on the layers. Usually, after the surface's preparation, a coat of primer is applied initially and allowed to dry.

Edges, nuts, and bolts are highly susceptible to corrosion. Hence, it is important to give these areas sufficient film to resist corrosion. It is recommended that the Dry Film Thickness (DFT) for weld, rough surfaces, corners and other areas fits the protective system specifications. Stripe coating allows these areas to keep up maximum adhesion in critical areas and DFT on edges. Facility painting benefits greatly from stripe coating, as it helps by increasing product longevity and ensuring lesser damage to the structures. Stripe coating is considered one of the most effective ways to avoid bridging, edge corrosion and breakdown of corners in a structure.

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