Wood trim, furniture and other common home items are traditionally painted with a high gloss sheen. Not only does gloss look nice, bu also it serves some practical functions on wood surfaces. A glossy finish helps lock out moisture, it's durable, and it is easy to wipe down for quick home cleaning. Glossy finishes are a good choice for wood, but if you don't use the right products and tools, you could end up with undesirable results.
Sand the wood with 150-grit sandpaper. For common wood surfaces, 150-grit sandpaper provides enough roughage to get rid of small surface imperfections while still leaving the surface smooth. However, if your wood contains a lot of major splinters and deep gouges, use 50- or 60-grit sandpaper first, then follow up with 150-grit.
Wipe off the sanding dust using a damp towel or rag.
Prime the wood with a stain-blocking wood primer. Apply the primer using a regular bristle paintbrush, brushing against the grain. Even if your wood is unfinished and unstained, natural wood tannins can sometimes bleed through general purpose primers. Stain-blocking primers cost a few dollars more per gallon, but they are worth the price. Wait for the primer to fully dry before continuing.
Use a foam brush to paint the wood surface with a high-gloss, oil-based paint. For larger expanses or wood, you could use a foam roller. Avoid bristle brushes or high-nap rollers, as glossy paints are more likely to show telltale brushstrokes and roller lines. For the best high-gloss finish, foam is the way to go. Since the surface is already prepped with primer, you don't need to worry about the wood grain direction as you paint.
Apply a second coat of high-gloss, oil-based paint after the first coat dries. Wait for this coat to dry. Your wood will now be fully sealed with a high gloss sheen.
Brush a coat of high gloss polyurethane gloss onto the painted surface using a foam brush if you want even more of a shine. Polyurethane is basically a clear sealant that provides extra gloss to the surface.