Coulomb blockade devices using wet coating with a colloidal Pd/Sn solution have been fabricated and characterised. The colloidal film was found to grow preferentially between the metallic contacts patterned on the sample surface. This preferential adsorption between the electrodes can lead to colloidal films of only one monolayer thick while in other cases a three-dimensional array of Pd clusters is formed. The I(V) characteristics of these two classes of devices exhibit a clear Coulomb blockade behaviour but the evolution of the current beyond threshold is quite different attesting for the difference in array dimension. The width of the Coulomb gap was found to decrease linearly with temperature.