PLGN 3.01 Removal / Partial removal of paint coatings

When removing or partially removing coatings, use methods that will not damage the substrate or adjacent surfaces or adversely affect subsequent coatings. Refer to BS 6150 Section 6: 53.2 Removal of Coatings (or as amended) for further guidance. On severely discoloured or weathered timber, prepare the surfaces by planing or machine sanding and cabinet scraping to produce clean timber. The specifier and/or the contractor, taking into consideration all aspects of the particular project, will determine the most appropriate method of paint removal which should then be carried out in accordance with the selected removal system manufacturers' instructions.

General guidance on the removal of paint coatings

When using chemical strippers, ensure that both the neutralising of all chemicals, and the removal of all surface residues, are carried out prior to re-coating. Where the removal of water-based coatings is requested, paint strippers specifically produced for such coatings are available and are normally more effective than general purpose paint strippers. Do not use alkali based strippers for timber substrates and ensure an alkali resisting primer is used prior to re-decorating when using this method for other substrates.

Abrasives and other mechanical stripping media should be appropriate for the surface to be stripped, selected to give efficient removal without damaging the substrate, and give the appropriate surface profile. Hot air strippers should not exceed 450°C air temperature to ensure surface damage does not occur. Surfaces painted prior to 1960 may have been previously decorated using paints made with lead pigment. Refer to ICI Site Work Instructions Clause SW4.22 for further information.