Sinks receive lots of wear and tear from an assortment of products and electronics that are used near them. Because of the products and the water from the sink, cracks form around the drain, stains show up on the surface, burns occur from hot objects, and scratches occur from sharp objects. Unlike other solid surfaces, cultured marble is 75 percent ground marble dust, with a glossy topcoat that is only on the surface. To fix minor scratches, burns or stains, you need to refinish this topcoat and attempt to hide the damage.
Do-it-yourself kits allow you to fix the problem yourself, while using professional products. They conveniently provide you with everything you need in one purchase. According to refinishingonline.com and bathwizard.com, both sites where kits can be purchased, burns, stains or scratches can be fixed with a surface restore kit that includes power stain removers, scratch removers, polisher and shine spray. Cracks can be repaired with marble repair kits, which include sandpaper, a cultured marble patch, liquid hardener and all of the utensils. These types of kits include finishing coats for a lasting finish.
On the downside, only solid colors are available, so if your marble displays swirls, these cannot be recreated. For large areas, consider redoing your entire sink so that the color will be uniform. It would still cost less than replacing.
Depending on the repair needed, some products can be individually purchased to do the particular job. According to naturalhandyman.com, after minor sanding of surface damage, use a product to restore the glossy finish of cultured marble, such as Gel Gloss, a polyurethane varnish, or paint with an epoxy base. The only way to repair burns is to buy the paint that is originally used for cultured marble, available at http://www.integritycoatings.com, but it is very expensive.
You might need to try multiple products before finding one that works with your damages. According to Tim Carter, author of askthebuilder.com, minor scratches and stains can be covered up, but major cracks cannot be repaired. You might end up spending a lot of money on a product that won't leave your sink looking new.
For major cracks and damages, hiring a professional might be the way to go. Professionals can get their hands on expensive paints and finishes that stores don't usually offer. Miracle Method, for example, offers to come to your house and use their Natural Accent products that they say keep a repair lasting five to 10 years. Other contractors will send you a repair kit to do it yourself with their ingredients.
Most companies give their products a name, without actually informing you of what the product is. You might be spending a lot of money for a product that you can purchase yourself. Many companies also say that they can fully repair your cultured marble, while most research indicates that cultured marble can be somewhat restored, but never fully repaired.