• Soot/flue condensates, iron pyrites, water, rust/corrosion products
• Surface contamination

Surface contamination or the presence of soluble materials within the substrate can result in unsightly visual effects disfiguring the paint finish. Surface contaminants should be removed and residual stains should be treated with an effective ‘barrier’ coating to prevent ‘bleeding’. In order to determine suitability of the proposed treatment, sample site trials are recommended.