I would like to cut out the precast cultured marble sinks in a bathroom countertop and replace them with drop-in or under-the-counter sinks. First, can this be done effectively? Second, what type of tool should be used?:confused:

Marble is one of the hardest material to cut. I would hilly recommend to get a marble counter company to do it for you. You really would find it hard to deal with considering to do this you would need to take the counter top out to put in the sink. To cut marble you would need a diamond tipped blade and it would have to be lubricated while cutting. It a hard job for less experience people. I would get a people that deals with this type of material rather then do it yourself.

Cultured marble is softer than granite and not that hard to cut. You can forget about under the sink because you'll not get a clean enough cut to show your edge. Cultured marble is more fiberglass resin and gelcoat than marble dust. I have done what you want to do with a jig saw and a wood cutting blade, strt with a pilot hole drilled right on the cutting line. The drop in sink will cover the cut edge and most drop ins come with a template. If you try this I'd recommend putting duct tape on the sole of the jig saw so you will not scratch the surface of the counter.

There's no need to cut anything out. My countertops were in good shape, but the sinks were bad. Someone referred me to a product called KwikBowl (Kwik-bowl: The Cultured Marble Solution). They came in, measured my sinks, manufactured a custom-fit sink and dropped them inside my old ones in about 10 minutes. And, at about $100 a bowl, it was a lot cheaper than cutting out the bowl or tearing out the whole countertop. I now have beautiful acrylic sinks that look just like I cut out the old one and put in new ones.