Longevity, maintenance and shape are things to consider when choosing between bath resurfacing with acrylic and steel.
No. Different manufacturers will use different formulations and thicknesses of steel and porcelain enamel. Likewise, acrylic can be different thicknesses or types, such as sanitary-grade acrylic. Some acrylics are also more UV resistant so they won't discolour from exposure to natural light.
Pressed steel baths with a good-quality porcelain enamel coating are extremely hard wearing and, when properly cared for, can last a lifetime. Good acrylic baths generally last 20-plus years.
Steel baths with a porcelain enamel coating generally won't scratch, but can chip under extreme circumstances. Acrylic baths resist chipping, but can scratch. Shallow scratches can be buffed out with a metal polish, but could leave a dullish spot, while deep scratches are more problematic.
Caroma Dorf says it sells three times as many acrylic baths as steel. Experts put the popularity of acrylic baths down to their lower cost and bigger range of shapes.
The moulds used to make steel baths cost hundreds of thousands of dollars, while those made for acrylic baths are a fraction of the price. For that reason, steel baths tend to be more classic designs, while acrylic baths are changed more readily with the times.
The biggest loss of water temperature is due to the water-air surface area, rather than heat transfer between the water and cooler acrylic or steel surrounds. Unlike steel, acrylic doesn't absorb heat from the water but, despite this, retains heat only marginally better.
So if you plan on bath resurfacing, check in with an expert in your area: