All paints are made of pigments, solvents, resins and certain additives. Latex paints come with water as a solvent while in oil-based paint the solvent is a mineral spirit. The solvent keeps the paint ‘wet,’ and as it evaporates, the paint will dry up. You are left with the resins, pigments, and additives, which are the lasting ingredients. The pigment gives it the colour, which binds to the surface with the help of the resin. Resins are generally epoxy, acrylic or silicone. Last are the additives that lend paint its unique properties, such as mildew resistance, smooth finish, etc
In both interior and exterior, the solvents and pigments have some similarities. Exterior paints can be oil-based or water-based, but for interior work, water paints are generally preferred.
Paints come in different formulations, colours, textures, and finishes and serve different functions, finding use in different applications under varied conditions. When making the ideal interior paint, manufacturers’ formulate a product with properties like stain resistance, easy cleaning, etc. On the other hand, exterior paints must have anti-fading and humidity-resistant qualities. When you begin a painting project, inside or outside the home, you must keep in mind the differences between the two and select the appropriate paint.
The main difference is in the resin contained as it is the resin that binds the pigment to a surface. For exterior paint, it is vital that the paint must be able to endure temperature changes as well as moisture. It must be tough and resist chipping, and fading under UV light. Therefore, these paints need a softer resin. For interior paints, the temperature is usually not a problem, and more rigid resins are used.
Resins that are added to exterior paint may cause the release of chemical vapours that last up to 48 hours, but small amounts may be released for extended time periods. It is, therefore, prudent to avoid the use of exterior paint inside of homes and offices. Masonry and stucco will do well with a coat of flat sheen exterior paint which will let the surfaces breathe, and moisture to escape. Brick walls will transfer moisture and therefore, must be allowed to breathe.
Interior paints are less tough than exterior paints but don’t release vapours, making them a safer bet indoors. However, despite that, it is better if you allow adequate ventilation when painting indoors. When surfaces need to be cleaned and scrubbed, choose a glossy finish paint meant for interiors.
Some Paints are both interior and exterior and can serve either purpose. When you need to pick an interior paint for either walls or ceilings, call Buildworld, we have an extensive collection of interior paints and pigments!!