EXPERT ADVICE FROM OUR A-Z PAINTING GUIDE

A-Z Directory / SOLVING PAINT PROBLEMS - Leaky Roofs (Galvanized Sheet Roofs)

Galvanized sheeting may develop rust spots with age or small gaps around nail heads and require patching to prevent leaks.

POSSIBLE CAUSE

Corrosion in older sheeting
Gaps where sheets are nailed
Cracks

SOLUTION

Remove all loose and flaking rust with a wire brush. Sand to remove remaining encrusted rust and to smooth. Thoroughly clean and degrease the area to be patched. An ammonia solution works well. Protect with an anti-corrosive primer, Rust Chem Universal Primer or if heavily rusted, Rust Chem Anchorlite Heavy Duty Primer.
Use Ulttima Roof Coating to patch leaks. This is not a normal roof paint but is a liquid plastic that must be applied in layers to the correct thickness – about 1mm total wet thickness or about 2-3 coats.
Patch holes by first applying a bitumen-based adhesive tape (eg.’Flashband’) or by embedding woven 2mm mesh fabric in the first coat.
First Coat: Thin a suitable quantity for the first layer with about 25% water and apply with a brush, broom or roller and allow to dry (about 1 hour). Second Coat: Apply normal strength in a horizontal direction to the water flow and allow to dry (4-6 hours/ or leave overnight).
Final Coat: Apply normal strength in the direction of the water flow and allow to fully dry to achieve leak-proof properties.

Caution! If the roof is made up of small sheets be careful not to seal the horizontal overlap which can accommodate runoff. Vertical seams can be sealed..
NOT RECOMMENDED FOR SHINGLE ROOFS

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A-Z Painting Guide

ABOUT THIS GUIDE

From Aluminum to Zinc and everything in between, this handy guide is a life-saver with specifications from our Vice President of Technical and Head of Innovation (who has been designing formulas specifically for the Caribbean environment for 30 years) identifying the exact coating system you’ll need to guarantee success in coating virtually any surface.

WHAT IS COVERED IN THIS GUIDE?

This guide details coating systems to effectively colour, coat and protect virtually any surface encountered in standard construction, renovation and maintenance environments. It provides an outline of the preparation required for successful coating and identifies recommended coating systems for a variety of substrates as well as how to effectively solve surface challenges.
Note: While every effort is made to detail accurate and effective systems, specific project conditions are unknown and can be highly variable. This guide is therefore limited and outlines generally applicable principles. It is not a specification.

WHAT IS NOT INCLUDED?

While Harris/ B-H Paints do supply specialist High Performance Coatings (HPCs) these fall outside the scope of this guide. HPCs are a class of technically advanced protective coatings designed to give superior levels of impact, abrasion and corrosion protection designed for aggressive environments including high traffic areas and in commercial and industrial applications.

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