HOW TO DO PAINTING WITH DRY DISTEMPER | OIL BOUND WASHABLE DISTEMPER (OBD)

HOW TO DO PAINTING WITH DRY DISTEMPER?

The surfaces to be painted should be prepared as described in the article. New surfaces should be allowed to dry for two months before painting. Dry distemper contains ghee like vehicles and looks like tinted powdered chalk. It is marketed as a powder.

The paint is prepared for application by mixing one kg of powder with 600 cc (0.6 litres) of clean warm water. It is allowed to stand 30 minutes before use. Whatever is mixed should be used on that day itself. They are generally used for plastered walls and are considered only just superior to whitewashing. Work is carried out as in cement painting but does not need curing with water. Its covering capacity is about 10 m2/kg per coat.

 

HOW TO DO PAINTING WITH OIL BOUND WASHABLE DISTEMPER (OBD)?

Oil bound distemper (OBD) comes as a thick paste. It is used as an intermediate costly paint for interior walls and ceilings where moisture is not present. It is an oil emulsion type of paint. Synthetic washable type distemper wears itself to a smooth, durable matt finish that can be wiped clean with water and mild soap.

 

Preparing the surface for painting with OBD. The surface should be prepared as given in the article. The newly plastered surfaces should be allowed to mature for a minimum period of 6 months. In previously painted buildings, remove all lime or colour wash and powder distemper from the wall by scraping. Cracked or flaking paint should be scraped off completely and the surface should be clean and dry before application of paint. Earlier, similar coatings of oil-based or emulsion based paints need not be removed if it is in good condition. However, the sheen on such surfaces must be removed by sandpapering.

For the best results in new walls, a coat of alkali-resistant cement primer (also called wall neutralizing cement primer) is applied and the dents, if present, are filled with suitable putty applied in the layers. One more coat of cement primer is applied over the places where putty was applied and OBD is applied only after it has dried over two days.

Preparation of paints for application. Water is to be added slowly to the thick OBD paste while stirring to bring it to a brushable consistency. Normally 500 to 800 ml of water is needed per kg of distemper, i.e. 50 to 80% dilution is made. Generally, three coats are prescribed over the cement primer for new surfaces and two coats on old surfaces. These are applied only at intervals of at least 24 hours between successive coats.

OBD is available in over thirty different colours and a suitable colour of distemper should be chosen for the work. OBD should not be used in places where moisture will penetrate. In such places, it peels off as the paint cannot breathe. A large number of such failures of OBD can be seen around us. The covering capacity of OBD is about 10 m2 per litre per coat.

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