This video shows a company using synthetic porcelain for Bob Villa of "This old House". This is not my company. I am not in any way, shape or form affiliated with this company. It is simply a good explanation.
Judging by the age of the video I would say this is 1st generation synthetic porcelain. As of 2012 -2014 we started using 3rd Generation Synthetic porcelain. This allows the professional to tailor the coating to the need of the surface. For example an acrylic bathtub will need to flex a little and a porcelain bathtub would not.
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