(1) Cleaning
1.1 Before painting, every surface, except surface coated by metal, shall be abraded by abrasive machine such as carborundum disk or other equipment. Then it shall be abraded by steel wire brush and sandpaper. Abrasive machine using wire shall not be used for a long period since it may burn metal.
1.2 Welds and steel surfaces affected by welding shall be prepared for painting as general surface by methods in 1.1.
1.3 Immediately before next painting, painted or coated surface shall be cleaned and slipping paint or rust shall be removed. The area subjected to grease and fats shall be cleaned. It shall be completely dried before a new paint.
(2) Unless otherwise specified, all structural steels shall be 3 times primer-painted by rustproof paints. Structural steel embedding in concrete is not required to be painted, but they shall be polished before concrete placing."