If you're on a budget and want marble without the high cost, then cultured marble sinks is it. Cultured marble sinks are also great because you're essentially helping recycling efforts. Cultured marble sinks are the combination of real marble mixed with resin. This doesn't make the sink any stronger but makes it weaker than a sink made completely from marble. Your sink sees a lot of wear and tear over the years and cracks can unfortunately be a byproduct of that use. You can throw the sink out and spend a lot of money to replace it or you can fix the crack. The article below will show you how to repair a simple to major crack in cultured marble sinks.
Step 1 - Silicone Caulk
Superficial cracks in cultured marble sinks are relatively easy to fix because they are typically small cracks in the surface. This means that they are not very deep and therefore easy to repair. You can do this using silicone caulk and a caulking gun. Since the crack is not deep enough to require the stone to be pushed together and merely patched the silicone will be enough to strengthen it. Load the caulking gun with the silicone caulk and install a tip on the caulk gun that will be small enough to get inside the crack. Fill the crack with the caulk until it overflows slightly. Give it time to settle and ooze using a wet finger to smooth it out and push it down. After an hour has passed use a damp rag to remove excess silicone from the sink. In a day you will be able to use the sink as normal.
Step 2 - Use of Epoxy
When a cultured marble sink has a deep crack, silicone caulk will not get the job done. Epoxy is a liquid plastic that dries hard. A deep crack needs to be filled with a product that can hold the weight of the marble. Epoxy comes in 2 parts which you will mix in a plastic bowl using a spoon. You will have to work quickly to avoid it setting. Pour the epoxy in the crack until it is about half full.
Step 3 - Strap It
You do not want to leave a large crack in the sink so you have to bring both halves together. The sink is typically too heavy to do this by hand. A binding strap is used to secure cargo to the back of a truck. Wrap the strap around the sink and connect at the bottom. Crank the strap until it is pulled tight and keep doing it until both halves of the sink come together.
Step 4 - Finishing
The epoxy will come out from the top of the sink but do not wipe it off. Wait for the epoxy to cure then sand it down until flush with the sink. Use a tack cloth to clean up the mess.