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Basic Knowledge about Top coat for auto paint part.2.
- Apr 04, 2018 -

Acrylic Urethane Vs. Polyurethane

Without realizing it, we frequently use items made out of urethane or polyurethane – and most of us are not even painters. Many may believe that the only real difference between the two are the compounds that make up polyurethanes (if we even think as deeply as that on the subject). But while polyurethanes are made up of several different urethane compounds, there are many more differences between polyurethanes and urethanes.

Although the main difference is the compounds (polyurethane is basically a chain of urethane organic compounds, and urethane has a main functional group of compounds).

Acrylic urethane differs from polyurethane in several noteworthy ways. For one thing, polyurethane chips and stains less easily than acrylic urethane. It also stands up better to substances like alcohol. Some acrylic urethane coatings rival or even equal their polyurethane competitors, but generally the latter continue to earn their reputation as the stronger of the two. Furthermore, acrylic urethane coats fewer square feet per gallon than polyurethane and “sticks” less easily to surfaces.

Like any coating, polyurethane finish has its downsides. It dries, sets, and cures considerably more slowly than acrylic urethane, which can dry within 10 minutes. In addition, buffing acrylic urethane to a gloss is easier than doing so with polyurethane.

The question remains: Which is better, polyurethane or acrylic urethane? As is so often the case when working with coatings, the nature of the project dictates which formulation is best. Acrylic urethane typically costs more than polyurethane, and its quality is less consistent across brands. On the other hand, polyurethane has a greater tendency to yellow in ultraviolet light. To prevent this problem, makers of pricier finishes — polyurethane and acrylic urethane alike — often add anti-yellowing substances to them.