"hobby clippers" to make cutting easier and more flush to model pieces. It may also be necessary to remove flash on model parts, which can be done with a hobby knife or "mold line removers" that some companies make. Once the model pieces are cleaned they are glued together with cyanoacrylate super-glues or, for plastic models, plastic cement. Pinning may also be necessary. Once assembled it may be necessary to remove excess glue or smooth the model's surface with small files or fine grit sandpaper and any gaps from where the pieces don't fit flush together filled with an epoxy putty, such as Milliput. Once the model is fully prepared primer can be applied if needed. Painting Brushes used for figure painting vary by the type of paint used and techniques employed. For paints that require specific chemical thinners, such as enamels, lacquers, and oils, synthetic fiber brushes are often recommended for longer life as the thinners can cause natural fibers to deteriorate over time, although natural bristle brushes are often used for finer details. For acrylic paints that can be thinned with water there is less concern about bristle deterioration. Many acrylic painters consider kolinksy sable watercolor brushes the be the best quality brushes for painting, as they offer a great deal of control over the flow of paint and a sharp, precise tip for painting fine details. Brush sizes can vary depending on the task. Some painters use extremely small brushes for painting the very fine details of a model. When working with slow drying paints such as enamels this can be true as the smaller brush sizes can produce finer lines more easily. However, when working with fast drying acrylics the small amounts of paint in a small size brush can dry quickly in the bristles, damaging the brush and making painting difficult, so many highly skilled display and competition painters advise against small brushes, instead recommending using larger brushes that have very finely pointed tips, such as kolinsky sable brushes, for precise and detailed painting. Airbrushes are also a commonly used tool for figure painting. An airbrush can be used to apply primer, either single color or zenithally, basecoats, and varnish quickly across large areas, as well as finer detail work such as creating color or value gradients and applying tints or glazes to large areas. For fine detail work smaller needle sizes are preferred, although