Penta Red Oxide (Quart)

General Surface Preparation

New and unpainted: Clean free of all dirt, dust, grease, oil, chemical deposits, fungus, algae and any other contaminants. Ensure surface is dry.

Ferrous Metals: Dust and dirt are best removed with a stiff bristle or wire brushes and compressed air. Remove oil and grease by solvents cleaning with Penta Thinner 41 or Thinner 11, in compliance SSPC-SP1-82. Clean the surface further by one of the following methods, depending on service conditions.

Type M – Moderate: This exposure is g
generally outdoors, and is characterised by normal weathering, and/or light or moderate concentrations of chemical fumes that combine with humidity and condensed moisture to corrode carbon steel at rates less than 3 mils (75 μm) per year. Zinc in this exposure is virtually free of corrosion. Light to moderate chemical fume concentrations in indoor areas without excessive humidity may produce similar conditions. For type M, moderate environments, Commercial Sandblasting (SSPC-SP6-82) is recommended. Where exposure is normal weathering only, Brush-off Blast cleaning (SSPC-SP7-82) or Power Tool Cleaning (SSPC-SP3-82) will provide excellent service.

Type P – Protected (Architectural): Surfaces are generally indoors in the normal humidity range and are not subject to chemical contaminants which will attack paint or steel. For Type P – protected environments, Brush-off sandblasting SSPC-SP7-82, Power Tool Cleaning SSPC-SP3 or Hand Tool Cleaning SSPC-SP2-82 will provide the sound substrate needed for proper adhesion.

Aluminium surfaces: Remove oil and grease by solvent cleaning with Penta Thinner 41 or Thinner 11 in accordance with SSPC-SP1-82. If necessary wash with water or water plus detergent to remove dirt, water soluble salts and similar contaminants. If detergent is used, rinse off thoroughly with clean water and allow to dry. Etch prime with 1 coat Penta Etch Primer

New Galvanize: Remove oil, grease, wax etc. by solvent cleaning with Thinner 41 or Thinner 11 in accordance with SSPC-SP1-82. For good adhesion, new galvanize may require sanding or brush sandblasting to remove silicate and water-sensitive clear, chromate coatings.
Water-washing with a dilute solution of ammonia or acetic acid, followed by thorough rinsing with clean water, may also be used to remove clear water-sensitive chromate coatings and contaminants.
Avoid use of soaps and detergents if possible, because residue may interfere with paint adhesion. Etch Prime with 1 coat Penta Etch Primer.

Weathered Galvanize: (Galvanize allowed to weather for at least 6 months to remove oils and many surface treatments) Surface must be thoroughly examined prior to painting, to ensure that it is clean, finely etched, and that the oxidized layer is uniform and tightly adherent. Scrub with water and a nylon brush to remove non-oily dirt and any water-soluble zinc or other salts. (Do not use steel-wire brush). Clean if necessary with Thinner 41 to remove any oily contaminants.

NB: New Galvanized surfaces are given surface treatments by the manufacturer to prevent wet storage staining (also known as white rust). These treatments, which include clear chromate coatings, oils, grease, waxes, silicon and silicates, may be detrimental to maximum paint adhesion, and must therefore be removed by solvent cleaning, sanding, brush blasting, weathering etc., before painting.

Rusted Galvanize: Derust by mopping the whole surface with Deruster 127 diluted 1:2 with water. Allow to derust for 2 to 3 minutes before rinsing off thoroughly, by hosing down with water. Do not allow Deruster 127 to dry off. Alternatively remove rust and clean as for iron and steel.

Previously Painted Surfaces: Remove all loose flaking, peeling and semi-adherent paint, sanding to a featheredge where necessary. The performance of any coating system applied over previously painted surfaces, is directly influenced by the type, age and condition of the old coating. If the previous coating can be easily scraped off of the surface, or if it lifts up on application of the first new coat, it should be completely removed. Hard or glossy paints should be dulled by sanding, sandblasting, or other abrasive methods to ensure maximum adhesion. Remove all rust, dirt, oily contaminants, water-soluble salts, fungus and algae. Treat rusted areas with Penta Deruster 127 Rust Remover and thoroughly rinse off.