This is a sink that I restored for a customer in Seattle, Wa. The biggest problems that I see with integrated kitchen sinks is that the molds that were being used did not have enough slope. I recommend at least 5/16 per ft. To seal the restoration I use CT Plus from Triangle Industries. The glossier that you get the surface the faster that the water gets into the drain. The customer usually will prefer a more matte finish, but the slicker the better. Lastly, educate your customer on the virtures of not letting a pot full of spaghetti sauce water sit overnight in your masterpiece. Acids are bad! I will post step by step photos of a sink repair and the methods that I used a little later.