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WHAT NOT TO PAINT - 12018_615
PAINTING SAFETY PRECAUTIONS

Basic Military Requirements (BMR) - Requirement for military advancement
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Electrical contact points and insulators The original enamel, lacquer, or crackle finish on all radio, electrical, and sound equipment, unless existing damage makes refinishing essential Decorative plastic, such as tabletops SURFACES TO PAINT The  Navy  uses  a  variety  of  metal,  metal compounds, and synthetic materials to build a ship or boat. Each type of surface requires special preparation and special primers and paint to extend its life cycle. In this section, you will learn about various surfaces and the procedures needed to maintain them properly. Aluminum Surfaces Aboard  ship,  aluminum  surfaces  are  a  special problem.  If  they’re  not  treated  properly,  corrosion results. Corrosion is greater when dissimilar metals (for example, aluminum and steel) are in contact with each other   and   are  exposed  to  seawater.  Seawater  is  an electrolyte  (an  electrical  conductor).  As  such,  the seawater causes an electrical current to flow between the steel and aluminum surfaces, resulting in galvanic corrosion of the aluminum. The first sign of aluminum corrosion is a white, powdery residue in the area where the  two  dissimilar  metals  make  contact.  Later,  the aluminum surface is pitted and scarred. Finally, there is a complete deterioration of the aluminum area. Holes in aluminum plate enlarge and screws, bolts, or rivets pull out, or they may even disintegrate. Before joining aluminum to another metal, give each surface a pretreatment formula and two coats of primer formula. NOTE Never use red lead as a primer on aluminum. If the joint is exposed to the weather, use insulation tape between the two surfaces, and fill the joint with caulking  compound.  When  aluminum  is  joined  to wood, give the wood one coat of phenolic varnish. Replace any missing fasteners (screws, bolts, rivets, and so  on)  with  items  of  the  original  type.  (NOTE: Replacements of stainless or galvanized steel may be used.)  When  painted,  the  best  way  to  prepare  the aluminum surface for repainting is to use hand scrapers, hand and power wire brushes, or fine grit sandpaper. Be careful  if  you  use  a  power  sander  to  prepare  the aluminum surface for repainting. NOTE Never use scaling hammers on aluminum. Steel Surfaces When painting a steel surface, preparation of the surface is important. Steel surfaces must be completely free of rust, loose paint, dirt, scale, oil, grease, salt deposits, and moisture before they are painted. Old paint  in  good  condition  is  an  excellent  base  for repainting.  Smooth,  thoroughly  clean,  and  dry  the surface before applying new paint. In touch-up painting (when only small areas or spots need repainting), remove old paint to the edges of the spot or area until an area of completely intact paint is reached. (NOTE: This area must be free of rust or blisters underneath the paint.) Feather the edges of the remaining paint. When completely reworking an old painted surface, take the old paint down to the bare metal. Then apply a primer before painting. Never leave a base metal surface exposed overnight. Always put on a primer coat before you secure for the day. Fillers Fill holes, dents, and cracks in all surfaces and open-grained woods before they are finished. Putty, wood fillers, and even sawdust mixed with glue can be used on wood. Use epoxy fillers on steel and aluminum surfaces. The method you use varies with the type of filler.  Therefore,  follow  the  instructions  carefully. Allow all fillers to dry and then sand them smooth before you apply the first finishing coat. Paint and Varnish Removers Paint and varnish removers are most often used on wood surfaces. However, you can use paint and varnish 18-15 Student Notes:







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