ACRYLIC%20SHEET%20EDGE%20AND%20SURFACE%20FINISHING.docx

Whether youre decorating a household object or piece

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Whether you're decorating a household object or piece of furniture, painting a model kit or working on your car, painting plastic surfaces presents a number of challenges that differ from painting wood or metal. To get the best results when painting plastic objects, you'll need the right supplies and preparation. Cleaning the Surface o The main problem with painting on plastic is paint adhesion. Plastic objects often have some slight residue left from the oils used to coat the mold, and some types of plastic surfaces won't allow the paint to adhere well. As a rule of thumb, the shinier the plastic, the less paint will stick to it. Before painting, you should clean the object with detergent and water or with a solvent-based cleaner. You may also wish to sand the surface with fine sandpaper to roughen it slightly. This makes the paint bond more easily. Applying a Base Coat o A base coat helps paint stick to your design and prevents the original color of the plastic from showing through. If you're painting a large area, use plastic primer, also known as adhesion promoter. If you're painting a small design on a larger piece, paint in the outline of your design with liquid sander, let it sit for about three minutes and then wipe it off quickly. You can then apply a base coat of black or white paint. Painting your Design o When spraying, brushing or rolling on paint, you'll get a better result if you apply several thinned-down coats rather than one thick one. The coverage will be smoother and more even. If the plastic object is meant to flex, you may want to add flex agent to the paint. This helps the dried paint bend when the plastic object bends, and should be added according to the manufacturer's instructions. If the object is rigid, this shouldn't be necessary. Protecting your Paint o Once the design has dried, you'll want to apply a coat of varnish or sealant to protect it from chipping and from the elements. Varnish is available in matte, gloss or satin finishes. You can apply it either with a brush or with a spray can. In either
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case, apply a thin, even coat over the painted area. Allow the varnish to dry in a dry, well-ventilated area in order to avoid clouding. Read more:
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