If your carpeting has suffered permanent damage due to a burn or stain, you don't have to hire a professional to repair the damage. People often hire professionals to mend damaged carpeting, and after observing the repair, they realize they could have easily completed the job in a matter of minutes.
Repairing a Burn
If you've discovered a burn, try to locate a piece of carpeting with similar wear as the area surrounding the damage. A piece of extra carpeting that was used for a runner is usually a good match for a moderately worn location.
If you don't have a piece of leftover carpeting and can't locate a match through a dealer, consider removing a section of carpeting from an inconspicuous area such as a closet. As a last resort, carpeting can be removed from under a piece of furniture that you don't plan on moving.
Begin by cutting away the damaged area with a sharp carpet knife. Cut all the way down to the surface of the padding, and remove a rectangular or square shaped piece surrounding the burned area. If the padding isn't damaged or burned, try to keep it intact.
Remove the piece you cut away, and use it as a stencil to create the patch. Pay careful attention to the direction of the pile, and trace the damaged piece on the back of the new carpeting with a marker. After cutting it out, you should have an exact replica of the damaged piece you removed.
Once you obtain a perfect fit, apply an even layer of carpet glue on the back and edges of the new piece. Carefully press it into place like a puzzle piece, and gently brush the fibers with your hand to blend and camouflage the repair. Let the glue dry for several hours before vacuuming or walking on the repaired area for best results.
Removing a Small Stain
If a small stain can't be removed with carpet cleaner, you can still get rid of it. If you have an extra piece of carpeting, or if you can obtain one from a dealer or from an inconspicuous area, it's possible to repair the damage. For best results, this meticulous method of repair should only be used for smaller stains. A larger stained area should be patched or replaced.
With a sharp pair of scissors, trim away the stained fibers, all the way down to the base of the carpeting. Once the stained fibers have been removed, trim off new fibers of the same length and shade from an extra piece of carpeting. The new fibers will be used to fill in the bare area.
Using a small paintbrush, carefully and thoroughly apply carpet glue to the bare spot. Using a pair of tweezers and a toothpick, position the ends of the new fibers into the base of the carpet until the area is entirely filled in. Allow the glue to dry completely before walking over the repair, and before vacuuming.
Source: www.DoItYourself.com