I have this left over from a previous fit done by someone who knew what they were doing. I want to use it for a small sink area and have a go myself. I can cut it fine, but does anyone know how seamless joints are made with this stuff ? Couldn't find anything on utube/google. Thanks.

You say 'man made quartz'. Do you mean a composite that includes quartz or a composite to simulate quartz? Does the product have a 'trade' name. Is the product 'solid' or a laminate? What is the product thickness?

it's 12 mm thick. Attached picture.

Thanks - this led me to search 'solid surface materials' and I found all I needed.