A coating composition comprising

• (a) 10 to 60 wt. % of one or more hydroxy-, carboxy- and/or amino-functionalized solid resins selected from the group of methacrylic resins, acrylic resins, polyester resins, polyurethane resins, epoxy modified resins with linear, branched or star structure,
• (b) 5 to 40 wt. % of one or more crosslinking agents for component (a),
• (c) 5 to 70 wt. % of a filler, such as, aluminum hydroxide,
• (d) 0 to 40 wt. % of a ground polymer material,
• (e) 0 to 35 wt. % of organic solvents,
• (f) 0.01 to 15 wt. % % of additives and pigments and
• (g) 0 to 30 wt. % reactive thinners.