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HD Sharman Ltd.
High Peak Works,
High Peak,
Derbyshire SK23 0HW

The Cut Edge Corrosion System

Seamsil 100 Cut Edge Corrosion System, is now only exclusively available and manufactured by Sharmans.

  • Industry leading 15 year guarantee.
  • Market leading proven performance from a trusted brand.
  • Endorsed by leading steel manufacturers.
  • Engineered for the roofing environment using inorganic Alkoxy technology to prevent chalking and deterioration.
  • Specified in confidence by surveyors and property managers for over 20 years.

The Problem

The quality of coatings on metal profile sheets has improved significantly in recent years. Nevertheless, the problems of delamination and deterioration of the coating presents an ever present risk to the integrity of roof structure and performance. Furthermore, the cut edge and overlapped joint remains especially vulnerable due to the effects of capillary action drawing Sulphur contaminated rainwater into the joint causing the double hazard of ‘topside’ and ‘reverse side’ corrosion.

Cut edge corrosion originates at roof edges and overlaps where water is trapped, largely through capillary action , making it difficult for rainwater to evaporate. Eventually the now “trapped rainwater” begins to dissolve the protective zinc layer and allows corrosion to creep and lift the factory applied coating (PVC/PVF2) from the steel substrate. Edge corrosion is a progressive problem and, if neglected, can develop away from the cut edge.

This destroys the weather sealed ap joint and gutter overhang, resulting in more extensive and expensive sheet repairs as the integrity of the roof has now been compromised. The result is an unsightly roof, scarred with lines of corrosion along the joints and random rust stains across the entire surface.

Why Seamsil 100?

Seamsil metal protection systems are designed to provide effective long life solutions to the problems of corrosion at cut edges and overlap joints on all types of profiled metal roofs. Seamsil is a silicone based remedial treatment formulated specifically to arrest the adverse effects of rust, chemical corrosion and industrial pollution, and is particularly effective in marine/coastal environments. Seamsil completely encapsulates the damaged lap joint area preventing further water ingress and therefore provides maximum protection against future reverse side corrosion.

Encapsulation Seamsil silicone systems have exceptional adhesion to cleaned and prepared surfaces and cure to provide a tough elastic seal, effectively encapsulating the damaged area to restrict further deterioration. Long Life Seamsil uses GE Silicone technology with its proven long life, being unaffected by UV or extremes of weather and temperature. Elasticity Silicone systems have good elastic and flexibility properties to withstand normal surface movements. This ensures continued optimum performance even in the most aggressive environments.

Colours Seamsil edge and overlap protection system is available in a range of colours to match the most popular shades used in industrial claddings. Silicone systems do not degrade by chalking and do not have self-cleaning properties. Any soiling can be removed by the application of a detergent wash. Silicones are compound polymer variations of silicon, found in sand and the second most common element in the earth’s crust. Silicones do not produce unwanted by-products or odour and at the end of life, break down naturally to inorganic silicates – again, found in sand.    

Key performance features

  • Weather and UV resistant.
  • Proven corrosion resistance.
  • Water repellent seal.
  • Primerless adhesion.
  • Remains tough and flexible.
  • Long life protection in elasticity and encapsulation.
  • Technology has natural anti-corrosion weather resistance.

Our Other Systems

Sharmans roof and gutter coating systems are guaranteed to extend building lifecycles.

Our market leading systems have stood the test of time, providing complete peace of mind to both specifiers and contractors since their market launch into the industrial/commercial roofing sector in 1985.

Book a Training Course

We run regular training courses at our purpose built training centres in Derbyshire and Wiltshire.

Arrange a CPD or Demonstration

Our specification team will visit you to deliver CPD training and system demonstartions using our purpose made rigs.

Request a Sample

We have both material and full system samples available, click here to request your sample.

Our Experience

See all case studies

Leicester Southern Fire Station

Ongoing leaks in the building of Leicester Southern Fire Station resulted in a search for an effective refurbishment solution.


“Plygene® Gutterline is a value added service for my clients and I am 100% confident in it every time.” Brian Steel of Steel Roofing in Castleford has been working with…

The Real Petfood Company

Water ingress was a major issue for the Real Pet Food Company. Guaranteed leak prevention and improved roof drainage was critical to the operation of the business.