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Dew-Point

WHAT IS "DEW POINT" ?
We have all experienced ‘Dew Point’ at some stage. Condensation on windows is an obvious example.

Dew Point is the temperature at which the air can no longer hold its water vapor and starts to form water droplets i.e. condensation. 
Condensation forms when air temperature lowers, reducing the amount of energy available to keep the water in vapor format.

When painting, it is essential that you are able to paint a surface and avoid condensation forming during the application and drying stages. The optimum surface temperature for paint application is normally around 6°C above the Dew Point; however some products may be more or less tolerant. 
When working with Nautix products, if in doubt, it’s always worth checking the relevant technical data sheet – available on our website – for further advice. Dew Point can be calculated using the relative humidity and the air temperature; however, Dew Point ‘look-up’ tables are widely available via the internet.

AVOIDING DEW POINT :
Work in good atmospheric conditions and control absolutely temperatures of substrate, ambient air and products (between 10°C and 25°C with a maximum atmospheric humidity of 85%). Do not apply paint when there is a chance of condensation forming on the substrate : substrate, ambient air and product temperatures must be close.

EXEMPLE :
Avoid painting when outside temperature changes quickly : often in autumn or spring when painting in direct sunlight, substrate has a much higher temperature than the ambient temperature or if the surface of your boat is much colder than the surrounding air, moisture in the air can cause condensation to form. As a result, the paint will not be able to adhere or will have a dull appearance when it dries. Therefore, we recommend  outdoor painting should not take place too early or too late in the day.