HOW TO DO PAINTING IRON AND STEEL WITH ENAMEL PAINTS? - HOMESLIBRO - Blogs on Home Related Solutions

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Friday, April 29, 2022

HOW TO DO PAINTING IRON AND STEEL WITH ENAMEL PAINTS?

PAINTING IRON AND STEEL WITH ENAMEL PAINTS

Enamel paints are available as ordinary enamel and synthetic enamel paints. Ordinary enamel paints are made from natural resins (solid residue obtained after distillation of turpentine oil from crude turpentine. Also known as resin). Synthetic enamel is based on synthetic alkyd resins. Enamel paints are available in interior and special exterior grades. In buildings, these paints are used to paint iron and steel products such as iron grills and steel windows. They are available as ready-mixed paints.

 

Method of Painting of iron and steel with enamel paint. The painting should be started only on clear sunny days. Painting is carried out in the following five operations:

1. Cleaning and sandpapering

2. Application of primer coat

3. Stopping and filling

4. Application first undercoat

5. Application of finishing coats

 

STEP-1, the surface is thoroughly cleaned by mechanical means of scraping, brushing with wire brushes. It is then smoothened with sandpaper.

 

STEP-2, the primer coat red oxide zinc chromate primer (IS 104) or preferably red oxide zinc chromate primer (IS 2074) is applied by brushes. After the first coat has completely dried, a second primer coat is applied, so that a film fully covering the metal is obtained. It is important that within the shortest period after cleaning, the first primer should be applied. This is particularly important in places with high humidity.

 

STEP-2: Now stopping and filling after the primer coat has hardened. We apply the paste filler coat. For this purpose, we first roughen the primer coat with emery paper (not sandpaper) without scratching and without damaging the primer coat. We free the surface from dust. Fill the deep dents with paste filler (as used in body rebuilding of motor cars) using a good putty knife pressing firmly into the dents and applying only the optimum pressure. Allow as many layers of paste filler as needed to get a smooth surface allowing each layer to hard dry. Then wet rub to a smooth finish using waterproof emery paper 280/320. After the last coat of paste filler is hard and dry, it is wet rubbed down where necessary. We then apply a coat of readymade filler (R/M filler) by brush. Allow it to dry and wet rub to a smooth finish.

 

STEP-4: it is to apply the first undercoat by brush with minimum brushmarks. The brush is held at about 45° to the vertical. Paint is first applied in vertical strokes until the surface is covered and then is applied crosswise with light strokes. Finally it is laid off with vertical strokes. This constitutes one coat.

 

STEP-5: now apply two finishing coats. The first finishing coat is applied (by brush or spray) and it is allowed to dry. We then gently remove the gloss for the entire surface by wet cut with waterproof emery paper 320/400. After the surface is dry and free from dust, we apply the second coat.

 

Notes:

1. Repainting of old iron surfaces is done first by cleaning the surface with turpentine oil to remove grease and perspiration of handmarks, etc. The surface is allowed to dry and then repainted.

 

2. If exterior surfaces of iron has developed fungi, it should be removed by ammoniacal copper solution or 2.5% magnesium silicon fluoride and allowed to dry (read the article: Guidelines of home painting)

 

3. The covering capacity of enamel paints is 18 to 20 m2/litre per coat.


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