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The first section of this paper describes a new procedure for UV powder coating of a (heat sensitive) porous substrate. The method comprises a) preheating the substrate, b) applying the powder onto the preheated substrate and c) curing the coating, with the proviso that after step a) and before step c) the temperature of the substrate should not increase. By following this procedure, vaious types of porous solid wood and other heat sensitive porous materials can be powder coated without visible defects, originating from outgassing. In the second section, a semi-crystalline and an amorphous binder system for UV curable powder coatings are compared in clear, pigmented and textured coatings on MDF. Both binder systems are very suitable for application on MOF, resulting in coatings with good properties, e.g. adhesion, hardness and solvent resistance. The former system excels in flow and is especially suitable for applications in which smooth and glossy coatings are desired. The latter system proves to be a convenient binder system for textured formulations, since only a small amount of surface structure additive is required to obtain coatings with a low gloss and good abrasion resistance.
