Modifiers matching coating:

• unwanted,
• frictional,
• organic,
• special,
• protective,
• decorative,
• exterior,
• nonconductive,
• thermoplastic,
• dark,
• architectural,
• brittle,
• loose,
• liquid,
• appropriate,
• suitable,
• additional,
• indoor,
• over,
• thick,
• overlying,
• polymeric,
• thicker,
• pearlescent,
• color,
• metal,
• hydrophilic,
• specialized,
• optical,
• visible,
• porous,
• clear,
• opaque,
• impervious,
• environmental,
• old,
• thin,
• outer,
• resistant,
• topical,
• permanent,
• refractory,
• expensive,
• marine,
• difficult,
• smooth,
• specified,
• hard,
• slippery,
• modern,
• stubborn,
• relevant,
• reactive,
• top,
• waterproof,
• external,
• aesthetic,
• impermeable,
• nonmagnetic,
• base,
• wet,
• corrosive,
• ordinary,
• nonmetallic,
• friendly,
• new,
• synthetic,
• fine,
• glossy,
• preservative,
• natural,
• sensitive,
• durable,
• biological,
• secondary,
• insoluble,
• functional,
• supplementary,
• abrasive,
• tough,
• temporary,
• industrial,
• ceramic,
• soft,
• magnetic,
• heavy,
• popular,
• transparent,
• solid,
• interior,
• reflective,
• common,
• viscous,
• colored,
• advanced,
• uniform,
• fragile,
• metallic,
• nonstructural,
• miscellaneous,
• plastic,
• nontoxic,
• internal,
• conventional,
• inorganic,
• chemical,
• standard,
• black,
• bituminous,
• traditional,
• optional,
• conductive,
• alternative,

Simple categories matching stubborn:

• soil,
• stain,
• residue,
• infection,
• animal,
• contaminant,
• condition,
• dirt,
• disease,
• material,
• deposit,
• item,
• substance,
• imperfection,
• coating,
• impurity,
• discoloration,