Paints and varnishes are used to protect metals, timber or plastered surfaces from the corrosive effects of weather, heat, moisuture or gases etc. and also to improve their appearance.
Paints in common use are classified as oil paints, water paints, cement paints and bituminous paints. There are some “special paints” used for special purposes e.g. heat resisting or fireproof paints, chlorinated rubber paints (for protection against acid fumes etc.) luminous paints (for visibility of painted surfaces in the dark) etc., etc.
Varnish is solution of resin in either oil of turpentine or alcohol. It dries after applying leaving a hard, transparent and a glossy film of resin over the varnished surface.
Varnish is applied : (i) to the painted surface to increase its brilliance and to protect it from the atmospheric action, (ii) to the unpainted wooden surface with a view to brighten the ornamental appearance of the grains of wood.
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| 10. | PAINTS AND VARNISHES | |
| 10.1 | General | |
| 10.2 | Classification | |
| 10.3 | Composition of Oil Paints | |
| 10.4 | Characteristics of a Good Paint | |
| 10.5 | Preparation of Oil Paints | |
| 10.6 | Removal of Old Paint | |
| 10.7 | Painting | |
| 10.8 | Painting of New Wood Work | |
| 10.9 | Repainting Wood Work | |
| 10.10 | Painting Plastered Surface | |
| 10.11 | Painting Iron or Steel Work | |
| 10.12 | Defects in Painting | |
| 10.13 | Enamel Paints | |
| 10.14 | Lacquer | |
| 10.15 | Fireproof Paint | |
| 10.16 | Cellulose Paints | |
| 10.17 | Alluminium Paints | |
| 10.18 | Zinc Paint | |
| 10.19 | Distempers | |
| 10.20 | Varnish | |
| 10.21 | French Polish or Spirit Varnish | |
| 10.22 | Wax Polish | |
| 10.23 | White Washing | |
| 10.24 | Co lour Wash | |
Learn : Repainting wood work,Repainting Wood Furniture,Repainting Doors,Repainting Cabinetry,wood floors Repainting wood work (i) If the old paint be unsightly, unsound, blistering or flaking off then it should be removed by the application of some paint remover, by scrapping or by burning the paint with a blow lamp. (ii) On surface disfigured by smoke a coat…
Learn : Painting plastered surfaces,New plastered surfaces Painting plastered surfaces (i) A plastered surface should be painted only after it has thoroughly dried, otherwise the paint would get spoil. (ii) To avoid sucking of paint by plaster soak the surface with a pore filling solution which will dry off leaving an impervious surface. A wash…
Learn : Painting new wood work : Knotting or killing the knot, Application of priming coat, Stopping, Application of finishing coats. Painting new wood work Following points should be attended to before painting new wood work: (i) Only well seasoned timber should be painted otherwise not only shall the paint be spoilt but…
Learn : Removal of old paint and painting : Remove the paint, old paint and painting Removal of old paint and painting REMOVAL OF OLD PAINT One of the following two methods could be employed to remove old paint from a surface : (i) Burning the paint by directing the flame of a blow lamp on…
Learn :Preparation of oil paints Learn : Composition of oil paint PREPARATION OF OIL PAINTS. To get started making oil paint, you’ll need: 1) Cold-pressed, raw, or unrefined linseed oil – Linseed oil tends to do much of the heavy lifting in many oil based paint formulations. The reason is that unlike most plant based…
Learn : Characteristics of a good paint,Paints, Paints Classification Characteristics of a good paint Paints Paints are used to protect metals, timber or plastered surfaces from the corrosive effects of weather, heat, moisture or gases etc. and also to improve their appearance. Paints Classification Paints in common use are classified as oil paints, water paints, cement…
Learn :Composition of oil paints: Base: White lead, Red lead, Zinc oxide (or zinc white), Iron Oxide, and metallic powders such as Aluminum, Copper and Bronze etc. are the commonly used bases,Vehicle: Oils most commonly used as vehicles are : Linseed oil, Poppy oil. Nut oil and Tung oil. Colouring pigments,Solvent or thinner,Drier,Inert filler Composition of…