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Civil Engineering Questions
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Ali Hamza
Ali Hamza
Mechanical
17 Jan 2019

What are enamels??

Enamels :

Enamels consist of bases like zinc oxide, etc. ground in varnish. 

Desired colouring pigments may be added to get the desired tint. They dry slowly leaving a hard tough and elastic film which is smooth and durable. Enamel painted surfaces are washable and are not affected by acids, alkalies, gases or steam. These can be made in any tint which are usually delicate and decent . Even though they are more costly than ordinary paints yet, because of their durability, they ultimately prove to be more economical due to being long lasting and showing more resistance capacity against weathering effect . They are equally good for use both on external and internal works.

Water wash or Color wash (White wash):

Preparation of wash materail:

Fresh lime slaked with water is mixed thoroughly with water in a tub and then screened through a fine, clean cloth. Thereafter glue, is added to it by dissolving it in water. After it the surface is cleaned and the white wash is applied with jute brushes. A white wash when mixed with colouring pigment such as yellow earth is called colour wash.

Preparation of surface:

Surface to be white washed should be clean, smooth and dry. In case of re-white washing, the surface should be thoroughly cleaned and cleared of all foreign matter. Loose white wash should be scrapped. All holes, depressions etc should be made fair and smooth by removing the scratch-able material and applying repairs before application of white wash. Nail holes and patches caused by the removal of old white wash scales should be made good with lime putty. Greasy and smoky spots should be cleaned. All new patches should be given an extra coat of white wash after they have dried before commencing regular white wash.