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Painting a Concrete Floor

Man Painting a Concrete Floor can be a daunting task. But by reading this information sheet and following a few simple guide lines some complicated issues can easily be resolved, and a professional result can be achieved.

Types of Paint: There are basically two different types of painting systems that can be used on concrete floors.

Firstly there is a rapid air drying rubber modified paint called 820 Walk Paving Paint.

Secondly there is a chemically resistant two pack epoxy enamel called 116 Nylocote.

Advantages of 820 Walk Paving Paint:

1) Easy to apply
2) Easy to re-coat worn areas
3) Low cost single pack system

Advantages of 116 Nylocote Two Pack:

1) Resistant to Oils & Chemicals
2) Long & Durable Lifespan
3) Suitable with drinking water & Food stuff

Which System should I use?: Bear in mind that the two pack system is approx. three times as expensive as the single pack system. If you have an area which is subject to a harsh chemical environment (E.G. Brewery, winery, dairy, Chemical plant, Automotive workshop) then the two pack system should be the only one to be considered.

However, if you have an area which is subject to light to average traffic and is not subjected to a harsh chemical environment (E.G. Household concrete floors, Storerooms, warehouses, paths, patios, driveways) then the single pack Walk paving paint system will be ideal.

Some areas may seem suited to both kinds of paint. In such a case the decision is essentially that 820 Walk Paving Paint is cheaper and easier to apply, but has a shorter life. Where as 116 Nylocote is dearer and more difficult to apply, but is longer lasting.

If the concrete suffers badly from salt damp (efflourescence) then it may be best to seek professional advice regarding the problem and the paints life on such concrete will be shortened dramatically.

Surface preparation for any paint system

Unpainted Concrete: New concrete should be at least 28 days old. Repair any damaged areas. The surface should be whip blasted or acid etched to remove all dirt and deposited materials from the surface. It is essential to note that the surface must be completely free from contaminants especially oil and grease.

Oil Contaminated Areas: WARNING: Oily or greasy floors are the most common cause of loss of adhesion of the paint. Floors that are badly contaminated with oil (e.g. many years of service) are difficult to clean properly. The cleaning and removal of oil and grease is a crucial step in any coating system.

For heavy oil and grease, steam or chemical cleaning is recommended.
For lighter oil and grease, cleaning and washing with an Industrial detergent may be sufficient. If unsure, please contact our Technical Service Department.

Acid Etching: Etch using a mixture of 9 parts of clean water to 1 part of Commercial Hydrochloric Acid. Add acid to water NOT water to acid as the reaction may be violent. Apply using a plastic watering can at the rate of 1 litre/3-4m2. Scrub into surface with a bristle broom and allow acid to re-act for 3-4 minutes.

Thoroughly wash away spent acid with clean water and allow surface to dry out.

Please observe all safety precautions whilst handling acid and acid preparations. Always use gloves, goggles and protective clothing.

Application: Topline normally recommends applying by brush or roller as this limits the amount of vapour and paint dust in the air. Under some circumstances we may recommend airless spray (please ask us before airless spraying). We do not recommend conventional spray as it is essential that the area to be painted can be well ventilated.

Do not paint in confined spaces or where fumes may build up without taking proper precautions such as ventilation or independent air supply masks.