The benefits of a water-based product includes quicker drying times, less smell, and easier cleaning up with brushes and rollers being able to be rinsed with water rather than white spirit, making the whole decorating process more environmentally friendly. Solvent-based products typically contain high levels of Volatile Organic Compound (VOC) and were traditionally for use on wood and metal surfaces, giving a glossy finish but associated with longer drying times and a strong smell, However, water-based products have typically low levels of VOC and have come a long way over recent years, with many companies offering a water-based paint equivalent to a solvent-based option. WHAT IS THE DIFFERENCE BETWEEN WATER-BASED AND SOLVENT-BASED PRODUCTS? The rate at which moisture passes through a coating is controlled by the permeability of the coating, the moisture content gradient, the film thickness, and the temperature. Moisture vapour will be able to pass through a coating equally well in either direction: from places where there is more moisture, to places where there is less moisture. Although almost all coatings will act as a barrier to liquid water, it is not correct to imply that coatings can be made so that moisture vapour can only travel through them in one direction. The special feature about the coating is that it keeps rainwater out of the substrate, but allows moisture that has found its way into the substrate escape as a vapour. ![]() ![]() The term 'microporous' is often applied to specialist paints and stains and describes a coating that acts as a barrier to liquid water, but allows water vapour to pass through. Yes, our Exterior Masonry Paint is microporous.
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