What are the common mistakes to avoid when refinishing furniture?

The most common mistakes when refinishing furniture can ruin a piece that could have been saved. First is skipping proper cleaning and prep, as many people sand or strip over dirt, wax, or grease, which clogs sandpaper and causes blotchy stain. Second is not removing all old finish, leading to uneven absorption. Third is sanding too aggressively or with the wrong grit, using 60 grit when you should start at 120, which creates deep scratches, or sanding through veneer, which is very thin. Fourth is not sanding with the grain, which leaves visible cross-grain scratches. Fifth is failing to use wood conditioner on soft woods like pine before staining, causing splotchy color. Sixth is applying too thick a coat of stain or finish and not wiping excess, resulting in sticky, drippy surfaces. Seventh is working in a dusty or humid environment, which causes dust nibs and slow drying. Eighth is not allowing enough drying time between coats. Ninth is forgetting safety gear like masks and gloves when using chemical strippers. Finally, rushing the process and not testing products in a hidden area often leads to regret. Patience and prep are key.