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

Cut edge corrosion systems

Seamsil 15 year cut edge corrosion system

Seamsil – cut edge corrosion system, the long established system manufactured by Delvemade is now only exclusively available from Sharmans.

  • 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
  • Industry leading 15 year system guarantee.

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.

The rate of breakdown of coatings is determined by location, orientation and design. Research has shown that the dominant factor for PVC type coatings is UV radiation and for thin Pvf2/polyester coatings, the corrosion of the zinc substrate through the permeability of the coating.

The result is an unsightly roof, scarred with lines of corrosion along the joints and random rust stains across the entire surface.

Why Seamsil?

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 and chemical corrosion, 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.

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.

Silicone systems have good elastic and flexibility properties to withstand normal surface movements. This ensures continued optimum performance even in the most aggressive environments.

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.

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.

The systems

The Plygene Gutterline system

The only BBA certified, 25 year guaranteed system on the market, there is nothing else comparable.

Architectural coatings system

Delcote Architectural coatings system is guaranteed for 20 years.

Rooflight coatings system

Delglaze Rooflight coatings system is guaranteed for 10 years.

Our Experience

See all case studies

M.T. Construction

“Plygene® Gutterline is specifically engineered to be seamless…anything with joints will always have the potential to leak.” M.T. Construction of Colchester have been an approved installers of Plygene Gutterline since 1998….


“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…

FirstGroup, Bus Depot

Continuous leaks in the roof of First Bus’s depot in Boyle Street, Manchester defied all remediation attempts.