Protective sealants for hard surfaces, namely, sealants for buildings; architectural protective coatings, namely, sealants for buildings; coating compositions in the nature of sealants, namely, sealants for buildings; sealer coatings for use on a variety of substrates, namely, sealants for buildings; hard surface sealants, namely, polyurethane sealants; penetrating sealants, namely, resin-based sealants for use on roofs, walls and pavements; sealants for buildings; waterproof sealants