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Liquid sandpaper is a solvent used to soften existing layers of paint and make them porous enough that you can effectively apply a new coat of paint. You rub the liquid sandpaper on, wait for it to work, and wipe it off—no literal sanding is involved. Liquid sandpaper can save time and is helpful if parts of the cabinet are hard to reach with standard sandpaper. However, like paint stripper, liquid sandpaper creates dangerous fumes and must be used with care indoors. And unlike sanding, it can’t fix any scratches or dings in your cabinets.

It can take as little as 30 to 60 minutes for wood filler to dry, but some products take up to four hours. Always read labels to ensure you're following the manufacturer’s instructions. Water-based wood fillers typically take longer to dry than oil-based or epoxy-wood fillers, especially when applied to large areas or deep cracks. Wood putty won’t dry completely, remaining slightly pliable.

You can paint over wood, wood-laminate, and metal cabinets, but you need to prepare the surface first. Plastic laminate cabinets and thin veneers may accept a layer of paint depending on their condition, but they require special techniques and paints. If your cabinets sag or have significant damage, it may be a better investment to replace your cabinets than paint over them.

Maintaining painted cabinets includes regular cleaning with non-abrasive solutions and avoiding harsh chemicals that may strip paint layers.