Honestly, you can usually fix this yourself—just match the repair to the material. First, figure out what the furniture is made of: powder-coated steel or aluminum, wood, HDPE plastic, or concrete. Clean the area with mild soap and water, wipe it with a degreaser, and let it dry completely. Don’t paint over dirt, grease, or rust.
For small scratches on powder-coated metal, get a color-matched touch-up pen or exterior enamel. Apply thin coats, let each one dry, and stop when the color blends. For chips, scrape off any loose paint, sand the edges with 400–600 grit so they feather out, treat rust with a rust converter, then use an exterior metal primer and a color-matched topcoat. A little clear coat can help match the gloss. Keep the coats thin.
For wood, sand lightly along the grain, fill deeper chips with exterior wood filler, then touch up with a stain marker or matching stain and seal with exterior oil or varnish. For plastic or HDPE, clean and lightly sand the area, then use an HDPE repair kit or exterior plastic paint—don’t try to melt it unless you really know what you’re doing. For concrete benches or planters, wire-brush the damaged spot, patch it with exterior concrete repair compound, smooth it out, and seal it.
Test the color in a hidden spot first. If it’s public furniture, check with whoever manages it before painting. If the chip is structural or the metal is bending or cracking, stop and get it repaired professionally. Otherwise, a small touch-up kit and an afternoon can save the whole piece.