What is Pinholing?

Pin-holing are tiny holes in the finish caused by surface porosity or other imperfections in the substrate. It is an occurrence of small holes which provide a path of exposure to the substrate from improper spray atomization or segregation of the resin from the pigment in the coating.Click to see full answer. Likewise, what causes Pinholing in glazes?David Finkelnburg: A pinhole is a glaze fault extending after firing from the clay body to the glaze surface. Any hole from the surface not reaching the body is simply a pit. Both may be caused by a gas bubble within the molten glaze bursting at the glaze surface.Beside above, what causes pinholes in paint? There are several causes of pinholes in paint film surfaces. They can be caused by moisture in spray-gun atomizing air during application, insufficient atomizing air pressure and unclean surfaces. In baked-on castings, they can be caused by gasses escaping from the porous substrate during the thermal cure. Thereof, how do you get rid of pinholes in glaze? Still most strategies to eliminate these involve attack on several fronts: Reducing burn-off by higher bisque or cleaner body (less lignite for example) Distributing body out-gassing by finer grinding. Giving the gases more time to escape by slower firing or using a fast-fire glaze that melts later. Can I Refire a glazed piece?Since these firings need a lack of oxygen in order for the glazes to develop, you can’t refire them in an oxidation firing (electric kiln) or all the reduction you did will be reversed. For example, in Raku, carbon causes the clay to go black where it isn’t glazed.