He also promised to make good pipeclay pottery and marbled wares which were to be as excellent as those of Strasburg. The expenses of his journey were paid, his sons were to be employed in the works, and it was stipulated that if the works increased to a great extent, 500 pounds (Valencian money), was to be added to his yearly salary. It was against the Count's express desire that pottery of an exclusively artistic character should be produced at Alcora; his chief object was to improve the industry itself. In one of his letters to Abadia, written in October, 1789, he says: "I wish to export the porcelain of my manufactory, but chiefly in common objects, such as cups of different kinds, tea and coffee services, etc. These may be varied in form and colour, the principal point being that the paste should bear hot liquids, for we Spaniards above everything wish that nothing we buy should ever break. By no means let time be wasted in making anything that requires much loss of time. The chief object is that the pastes should be of first-rate excellence and durability." Cloostermans suffered much discomfort and annoyance from other workmen at Alcora, who were envious of his merit: they put every difficulty in his path, insulted him daily with pasquins, accused him of not fulfilling his religious duties, and annoyed him incessantly. His letters are full of these complaints. Count Aranda treated him with every consideration. During Cloostermans' stay at Alcora, the pottery made improved greatly in artistic merit. Figures and groups of many kinds were attempted, and even Wedgwood jasper ware was creditably imitated. In 1789, among other pottery that was sent to Madrid were "two hard paste porcelain cups, adorned with low relief in the English style." The most important one was moulded by Francisco Garcés, the garlands and low reliefs by Joaquin Ferrer, sculptor, the flowers on the covers by an apprentice, helped by Cloostermans. The composition of these objects was suggested by Abadia, who brought some specimens from Paris which came from England. Cloostermans sent the Count in 1789 a number of objects of different kinds made of porcelain. Among them the most interesting were "a tea and coffee service painted and gilt of glazed porcelain, and ten unglazed figures. Those painted by Albaro are marked A, those by Escuder, E, and by Mas, M, and Cloostermans' son." A large and varied collection of marbled wares and toys were sent at the same time. Cloostermans' marbled wares are pronounced superb. Count Aranda writes in July, 1790, to Diez Robles alluding to a large collection of pots for plants, which were made at Alcora for the King, decorated with the royal arms. Another series are still to be met with at the Royal Gardens; they are of pipeclay, and ornamented with rams' heads.