No. “Weak spots” are the result of the vacuum molding process used to make acrylic spas. As the acrylic is stretched over the molds, it is difficult to maintain a consistent wall thickness on the corners and other edges of the shell. Spas made this way will usually have strength added to the shell by applying fiberglass layers. This process can trap air bubbles between the layers, which, over time and exposure to hot water, begin to work their way toward the surface of the shell. In some cases, a bubble will break and create a hole in the acrylic shell. A stainless steel spa shell will have a consistent and even material thickness throughout the entire vessel.

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