Simple categories matching non-porous:

• flooring,
• rock,
• substrate,
• surface,
• material,
• item,

Members with property non-porous:

• wood,
• snowmobile,
• silicon,
• metal,
• paint_work,
• paint,
• kayak,
• glassware,
• mineral,
• foil,
• granite,
• memory_glass,
• paper,
• mirror,
• plaster,
• nylon,
• painted_surface,
• semiconductor,
• linoleum,
• rubber,
• windows,
• aluminium,
• diamond,
• formica,
• window,
• tile,
• skateboard,
• optical_coating,
• jet_ski,
• food_packing,
• glossy_paper,
• glass,
• fiberglass,
• dominos,
• ceramic_tile,
• counter_top,
• tile_floor,
• porcelain,
• enamel,
• finished_wood,