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Allter We coat the alternate way

About us

The Allter’s founders have both more than 25 years experience in the international coating industry. Allter is driven by the same ideals as Frans Nooren Afdichtingssystem BV from Stadskanaal the Netherlands. This is the contractor's approach. Allter stands for ALL-ROUND and TERRA. We believe in biomimicry and the natural way when protecting assets without any hassle. We firmly believe in guaranteed solutions from cleaning, prep, coating, testing and education. We are convinced that our different and better approach willl make a difference in the world of corrosion prevention and sealing.

Allter BV owns the brands Strongpipe, Dutchwerk, Cleaniq. The company is founded by Mr. Ing. Sander Hofstee and Mr. drs. JF (Frits) Doddema. Both men have their roots in the Netherlands and many years of experience in the field of Thermal Spray Aluminium, construction of sandblasting equipment, coating contracting and development plus sales of so-called visco-elastic coatings, shrinkable sleeves, pipeline tapes and cathodic protection systems for pipelines.

Drop of gel


The Netherlands’ residents are known worldwide for their never-ending battle with the water. Water defines the Dutch. Stories such as the one about Hans Brinker are exaggerated for effect, but also reflect reality; a country that constantly struggles to keep out the water, where the majority of residents live below sea level.

This is where in the 1980s, Frans Nooren grew to be an expert in watertight sealing systems. Such seals protect wet quays and basements walls against water penetration around conduits and pipes. His ambition was to develop solutions that are friendly to both humans and the environment. Ultimately, his expertise resulted in the creation of a self-sealing compound; Stop Aqua was born in 1988.

Frits Doddema subsequently joined Stopaq in 2005 to help broaden the fields of application. Furthermore, based on his background in the curing of industrial liquid coatings, he felt that in many cases, people unfairly blamed coating failures on the quality of surface preparation and means of application.

Doddema assembled a dedicated team of specialized cathodic protection and coating professionals, and along with his colleagues, created many problem-solving patents, like for underwater coatings.

The team of Allter has been supplemented by innovators and coating professionals who are pioneers in the field of surface preparation and sustainability of oil, gas and water pipes and infrastructure projects both on and offshore.

The goal of the Allter team is to make the best possible alternative contribution to a more sustainable world through the preservation of assets such as windmills, bridges, quays, jetty piles, risers, pipelines, railways, marine vessels and steel or concrete structures. The alternative solutions are usable for:

Frozen water

Mission and Vision

Our mission is short and sweet:

Develop the most obvious corrosion preventative coating and systems as a guaranteed solution when it comes to people, the environment and user-friendliness for outdoor applications.

Our objective:

Offer the world's best coating alternative.