Those old wood frames looked great when you first got them, but over time, they became worn and dated. Where they used to complement your color scheme, now they stick out like a sore thumb. Rather than tossing them out, invest a little time and repaint them. Whether they're raw wood, varnished or painted, you can update them to suit your tastes. Painting all the frames in one room with similar colors will pull the space together and help draw the eye from one picture to another.
Disassemble the frame and remove the glass and hardware. Clean the frame with mild dish soap and water. Allow the frame to dry completely before proceeding. Put a tiny dab of petroleum jelly on any hardware you can't remove but don't want to paint.
Sand the surface of the frame lightly on all sides, first with 60-grit sandpaper and then with 120-grit sandpaper. Sand enough to lightly abrade all areas, front, back and in the lip where the picture sits, to allow the primer to bite into the wood's surface.
Lay down cardboard or newspaper on the grass or driveway to create a work surface.
Wipe down the frame with a tack cloth to remove all sanding debris. Shake the can of primer for at least one minute and occasionally during painting. Put on the disposable gloves.
Spray the frame back with primer. Spray in short bursts, keeping the can from 6 inches to 1 foot away. Keep your hand in constant motion, back and forth over the frame's surface, and only press the nozzle to release the paint as you pass over the frame. Allow the back of the frame to dry. Hang the frame on one finger and spray the outside edges. Lay the frame on its back side on the work surface. Spray the front, including the inner edge and the small lip where the picture sits. Let the primer dry completely.
Shake the can of enamel paint for at least one minute. Topcoat the back of the frame using the same technique that you used to prime. Add a second coat to the back of the frame, if needed, according to the manufacturer's directions. Allow the back of the frame to dry. Spray the sides, and then flip the frame over and spray the front. Allow it to dry. Remove any petroleum jelly with a paper towel.