Denso Protal ST epoxy mastic protects surfaces in challenging environments

Protal ST epoxy mastic is available from Denso.

Canadian businesses know to count on the team at Denso North America for an unmatched selection of sealing and anti-corrosion products for infrastructure and pipelines. Among these solutions are Protal liquid coatings, which are trusted widely for solving problems in challenging environments – like the unique Protal ST epoxy mastic. Designed for tasks in which steel grit blasting is not feasible, this surface-tolerant coating provides world-class protection in long-term exterior exposure.

High flexibility, hardness, adhesion

Protal ST epoxy mastic is a two-part, high-solids, quick-drying coating that functions on its own or in combination with other topcoats for long-term water exposure. The Denso team recommends it for applications involving structural steel, pipe externals, pipe racks, tanks, offshore platforms, locks, gates, and bridges. Users can apply this mastic directly onto wire-brushed rusty steel substrates, to get long-term protection through its adhesion and high penetration.

Among the key benefits of Protal ST: minimal surface preparation; high water and seawater resistance; good resistance to acids and alkalis; low volatile organic compounds; and high flexibility, hardness, and adhesion.

Workers are advised to remove loose scale, rust, or foreign matter from the surface before applying this mastic, according to SP2 “Hand Cleaning” or SP3 “Power Tool Cleaning” or through high-pressure water wash. Next, clean and dry the surface with compressed air or brushing, leaving a faint metallic sheen. The next step is to pour the Protal ST hardener into the base component and mix it slowly and thoroughly for two minutes with a power whip.

Before applying the coating, make sure that the substrate temperature is at least three degrees Celsius above the dew-point temperature. Then apply the first coat by brush or spray to a wet film thickness of ten mils. Denso recommends applying the second coat to the same wet film thickness after at least four hours at 25 degrees Celsius. Finally, apply a final weather-resistant top coat by spray or brush when the coating is fully dry.

Protal ST can be applied in temperatures from -29 to 52 degrees Celsius. For temperatures under ten Celsius, preheat the surfaces.

For more information, contact Denso.

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