Rubbing Down Old Paint and Re-Decorating with New Paint

In many cases, if old paint is in good condition and the new coat will marry with the old, it is not necessary to remove it. The surface may need rubbing down with a wet-and-dry paper, used wet. Rubbing down will slightly roughen the surface and provide a good key for the new undercoat.

Blistered or flaked paint must be scraped back to a firm edge. ‘Feather’ the edges with the abrasive paper until they are level with the surrounding surface.

Any indentations, cracks or joins in interior woodwork should be filled with cellulose filler before priming.

All distemper should be completely removed by being washed off thoroughly with warm water. Distemper and non-washable distemper used on ceilings, consisting of glue and whiting, are very hard to remove and difficult patches may have to be scraped away with a paint scraper.

Before applying a new coat of water-based paint, the surface should be sealed with a primer.

If the distemper is covering ceiling paper, the paper may need soaking two or three times. Scrape off the paper with a broad stripping knife. Take care not to dig too deeply, or you may gouge out a hole in the plaster.

Emulsion or any water-based paint should be sponged down with detergent and warm water. Again, work from the bottom upwards for the first wash and then wash down with clean water from the top.

If the surface feels rough when dry, rub it carefully down with fine glasspaper. Remember to dust down the surface before painting.

Other paints, such as enamel paints, oil paints, oil-based gloss paints and water-based gloss paints should also be washed down with detergent and warm water to remove grease and dirt.

After rinsing with clean water, allow the surface to dry and then smooth it with wet-abrasive paper, held over a sanding block or a conveniently sized piece of wood.

To remove very bad imperfections on woodwork, such as sags and runs, a soda block, which is very coarse, can be used to rub down the surface. After rubbing down with abrasive paper or soda block, finish with a fine glasspaper or a fine wet-and-dry paper.

Basically, the surfaces that need to be painted can be divided into two categories: internal and external surfaces which may be old paint surfaces that need preparation and repainting; and new internal and external surfaces that need treatment. These surfaces may be wood, metal, plaster, stonework, rendering or paper.

Externally, paint is normally applied to wood, metal or rendering. Unexposed wood or metal will soon deteriorate if left to the elements. It has to be protected from the action of frost and rain. New wood should be well seasoned and matured. Softwood needs planing as paint brings out the irregularities in the grain. Hardwood, used for sills and door thresholds, can be given a clear finish. Stop any joints or indentations with oil-based putty stained to match the wood.

Door and window frames made of softwood should be rubbed down or planed smooth. Patent knotting should be applied to knots and on resinous areas. Wood primer should then be applied, ensuring that it is well brushed in so that the grain is filled.

Hardwood window sills and door thresholds provide a good surface for paint.

14. June 2012 by admin
Categories: Decorating, Painting | Tags: , , | Comments Off on Rubbing Down Old Paint and Re-Decorating with New Paint


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