Giromax® Edgecoat Application Guide

Giromax® Edgecoat treats cut edge corrosion on profiled galvanised roof sheeting. One of our many market-leading products, this coating system will cope with the movement of metal roof sheets. This is an application guide to help you treat the corroded edges of a roofing system. We have also included best decorative practice for roller, spray or brush application.

24 May 2022
3 minutes

Spraying vs roller vs brush application

The Giromax range has been developed to be user friendly and multipurpose. Although our products can be applied in different ways, there are preferred methods to apply our coatings.
The following guide is for best decorative practice:

  • Brush application – the best approach for a thorough application is to start by stripe coating the area with a brush. This is our preferred way to apply a coating.
  • Roller application – applying paint using a roller can lead to air entrapment and bubbles within the paint film, which reduces the efficacy of the coating. We would recommend a brush application before a roller application.
  • Spray application – this method is preferable to roller application, but only after a brush application, as these two techniques combined provide full paint coverage.

Preparation for treating cut edge corrosion

Before the application of a coating to treat cut edge corrosion, the correct preparation needs to be carried out. First, remove any non-adhering rust staining, swarf, dust and debris, then clean back the corrosion to the Swedish Standard ST3, so you are left with a bright metallic surface. Ensure the surface is not polished and that the edge of any remaining coating is firmly adhered and well feathered. The area must also be free from any oil, grease, ice or frost. Finally wiping down with Giromax® Panel Wipe will ensure surfaces are free of dirt, mould, oil and grease.

Two step application process

Step 1

The Giromax® Basecoat epoxy primer forms part of the Giromax® Edgecoat system. Part A of the Basecoat must be mixed wholly with Part B (do not part mix). Apply the Basecoat in a continuous uniform line, preferably by brush to achieve the correct film thickness. Ensure the firm edge is overlapped by ideally up to 50mm (minimum 10mm) and full coverage of all exposed metal including the sheet edge has been achieved.

Wait until this coating is touch dry before proceeding onto the next step. Never use thinners with the Basecoat and do not use when the pot life has been exceeded.

Step 2

Where necessary; on sheet overlaps, including flashing laps and panel-to-rooflight laps;
gun apply Giromax® Sealant to the joint in a continuous line. Next, tool the sealant in an upwards direction with one coat of Giromax® Edgecoat. Apply by brush ‘wet on wet’ to achieve a smooth fillet to encapsulate and obscure the leading edge of the top sheet.

The next step is to apply Giromax Edgecoat to create a protective layer over the Basecoat. On overlaps, apply the Edgecoat to either side of the joint in a continuous uniform band at least 75mm wide. Make sure you overlap the Basecoat layer by 10mm to achieve a minimum dry film thickness (DFT) of at least 265 microns (μm).

For sheet end gutter overhang, eaves and flashing edges apply in a continuous uniform band at least 75mm wide. Make sure you overlap the Basecoat layer by 10mm to achieve a minimum dry film thickness (DFT) of at least 265 microns (μm).

Ensure the application has contact with the sheet underside to achieve full encapsulation of the sheet cut edge.

Always stir Giromax® products thoroughly before use. If required, only use a Giromax branded thinner. Application should start at a point furthest from the roof access to avoid disturbing new lap seals. If the cut edge corrosion is beyond its primary fixing, do not proceed and speak to our team for further guidance.

Giromax® Edgecoat is a moisture tolerant, BBA certified formula, which has been designed to treat both the top and reverse sides of the cut edge. This revolutionary cut edge corrosion treatment provides protection for up to 15 years.

If you need additional guidance on Giromax® Edgecoat application or advice about any of our products, please speak to the Giromax team or call 01455 558969 today.

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Giromax® Data sheets + Specifications, Girocote Data sheets.